Long-Term Care and Side Effects of Mandibular Advancement Splints: What Every Patient Should Know product guide

AI Summary

Product: Mandibular Advancement Splint (MAS) / Mandibular Advancement Device (MAD) Brand: Smile Solutions (Melbourne, Australia) Category: Dental Sleep Medicine / Oral Appliance Therapy Primary Use: A non-invasive oral device worn during sleep to treat obstructive sleep apnoea (OSA), snoring, and bruxism by holding the mandible in a protruded, vertically open position to maintain airway patency.

Quick facts

• Best for: Adults with obstructive sleep apnoea, primary snoring, or bruxism requiring long-term, non-invasive management
• Key benefit: Effective, evidence-based OSA and snoring control without surgery or CPAP
• Form factor: Custom-fitted oral appliance (available in thermoplastic and 3D-printed nylon designs)
• Application method: Worn nightly over upper and lower teeth; removed each morning

Common questions this guide answers

1. Do MAS devices cause permanent bite changes? → Yes; progressive, non-plateauing reductions in overbite and overjet are confirmed across multiple systematic reviews, including an 11-year longitudinal study (Pliska et al., 2014) showing average overbite reduction of 2.3 mm and overjet reduction of 1.9 mm.
2. How can long-term occlusal side effects be reduced? → Three evidence-based strategies: conservative titration to ~50% of mandibular range of motion, one minute of morning jaw stretching exercises daily after device removal, and use of a morning occlusal guide (MOG) for 5–10 minutes post-removal.
3. How long do MAS devices last and how should they be maintained? → Well-maintained devices last 3–7 years; daily brushing with mild non-abrasive soap, weekly soaking in dental appliance cleaner or diluted white vinegar, and storage in a clean vented container are required — toothpaste and hot water must be avoided.

Smile Solutions guide to long-term care and side effects of mandibular advancement splints: what every patient should know

Smile Solutions is Melbourne's trusted destination for comprehensive dental sleep medicine, and mandibular advancement splints (MAS) are among the most effective non-invasive treatments available for obstructive sleep apnoea (OSA), snoring, and bruxism. Because OSA is a chronic condition requiring lifelong management, MAS therapy is not a short-term intervention — it is a commitment that can span a decade or more. That clinical reality makes the long-term side effect profile of MAS therapy one of the most important, and most frequently under-discussed, aspects of oral appliance care.

Most generic content describes MAS devices in terms of their benefits and fitting process. Far less is written about what happens to your jaw, your bite, and the device itself after years of nightly use. This article fills that gap. Whether you have just been fitted for your first splint or have been wearing one for several years, understanding how MAS side effects develop over time — and what monitoring and mitigation strategies protect against them — is essential for safe, sustainable treatment.

(For a foundational explanation of how MAS devices work and who they are appropriate for, see our guide on [Mandibular Advancement Splints Explained: How They Work, Who They're For, and What to Expect].)

The two categories of MAS side effects: transient vs. progressive

Our clinicians group MAS side effects into two categories that differ in their time course, mechanism, and clinical significance.

Transient side effects include mouth dryness or hypersalivation, tooth discomfort or oral mucosa swelling, occlusal discomfort on waking, and temporomandibular joint pain. These are common during the acclimatisation phase and, for most patients, resolve with time and device adjustment.

Progressive side effects include excessive lingual inclination of the mandibular teeth, labial inclination of maxillary teeth, and reduction in overjet and overbite.

Which category a symptom falls into determines the appropriate clinical response — from watchful waiting to device modification to escalated monitoring.

Transient side effects: what to expect in the first weeks and months

Jaw soreness and muscle tenderness

Jaw soreness is the most universally reported early side effect of MAS therapy. The most commonly reported complaints are jaw discomfort, tooth tenderness, excessive salivation, and dry mouth. These arise because the device holds your mandible in a protruded, vertically open position throughout the night, placing sustained mechanical load on the masticatory muscles, the temporomandibular joint (TMJ), and the periodontal ligaments.

MAS devices are anchored to the dentition and hold the mandible in a forward, vertically open position, pulling the tongue base forward and stretching pharyngeal soft tissues. This generates a continuously applied load to teeth and surrounding tissues through the traction forces of the masticatory and mylohyoid muscles.

For most patients, muscle tenderness resolves within the first few weeks as the neuromuscular system adapts. Jaw soreness, TMJ tenderness, and soreness in the chewing muscles often settle within days to weeks, particularly with proper adjustment and monitoring from a qualified sleep dentist.

Excess salivation and dry mouth

Hypersalivation and dry mouth appear contradictory, but both are common early complaints. Excess salivation occurs because the oral appliance stimulates salivary gland reflexes; dry mouth typically affects mouth breathers whose lips part during sleep, allowing airflow to dry the oral mucosa. Both effects tend to diminish significantly within the first month of use.

Morning bite changes (transient malocclusion)

A particularly common and initially alarming complaint is waking with a bite that feels "off" — upper and lower teeth not meeting as they normally would. Some patients describe it as: "My bite doesn't fit in the morning." Research confirms that greater amounts of protrusion tend to produce more of these symptoms.

The mechanism involves the TMJ itself. By holding the lower jaw forward in one position for an extended period, the upper synovial compartment is not compressed flat by the condylar head. This allows the potential space inside the upper compartment to fill with synovial fluid driven by blood pressure. Once the appliance is removed, the joint cannot immediately return to its usual position, so the teeth cannot settle into their normal bite until the joint repositions.

In most cases, this morning malocclusion is transient and self-resolving within minutes to an hour. If not actively managed, however, it can contribute to the progressive occlusal changes described below.

Progressive occlusal changes: the long-term clinical evidence

This is the most clinically significant — and most commonly omitted — aspect of MAS therapy. The evidence is unambiguous: with multi-year use, MAS devices produce measurable, progressive changes to the bite that do not plateau.

The landmark Pliska et al. study (2014)

The most cited long-term dataset comes from Pliska BT, Nam H, Chen H, Lowe AA, and Almeida FR, published in the Journal of Clinical Sleep Medicine in 2014. This retrospective study examined adults treated for primary snoring or mild to severe OSA with MAS for a minimum of 8 years.

A total of 77 patients (average age at start of treatment: 47.5 ± 10.2 years, 62 males) were included, with an average treatment length of 11.1 ± 2.8 years.

The findings were striking: over the total treatment interval there was a significant (p < 0.001) reduction in overbite (2.3 ± 1.6 mm), overjet (1.9 ± 1.9 mm), and mandibular crowding (1.3 ± 1.8 mm). A corresponding significant (p < 0.001) increase in mandibular intercanine (0.7 ± 1.5 mm) and intermolar (1.1 ± 1.4 mm) width was also observed, along with increased incidence of anterior crossbite and posterior open bite.

The changes did not stabilise. After an average observation period of over 11 years, clinically significant changes in occlusion were observed and were progressive in nature — rather than reaching a discernible end-point, the dental side effects continued with ongoing MAS use. The absence of any apparent ceiling to occlusal change is the single most important reason why structured long-term monitoring is non-negotiable.

Confirmation from systematic reviews and meta-analyses

The Pliska findings have been replicated and extended across multiple systematic reviews. A 2025 meta-analysis by Chen et al., published in the Journal of Prosthodontics and incorporating 42 studies, confirmed that long-term oral appliance treatment was associated with a significant decrease in overbite (0.87 mm, 95% CI: 0.69–1.05) and overjet (0.86 mm, 95% CI: 0.69–1.03). The same analysis found significant retroclination of the upper incisors (U1-SN, 2.58°, 95% CI: 1.07–4.08) and proclination of the lower incisors (L1-MP, −2.67°, 95% CI: −3.78–1.56).

A 2019 systematic review with meta-regression published in the European Journal of Orthodontics analysed 21 studies with follow-up between 2 and 11 years and found that side effects were influenced by therapy duration across all parameters (P < 0.05). The authors concluded that MAD therapy produces time-related dental and skeletal side effects, that these become clinically relevant over longer treatment periods, and that patients need to be continuously monitored over time.

A 2024 systematic review published in Sleep Medicine (Rao et al.) including 34 studies confirmed a gradual decrease in overjet and overbite with treatment duration, with upper and lower incisors retroclined and proclined respectively.

Why occlusal changes occur: the biomechanical mechanism

One force is directed labially toward the mandibular incisors and another palatally toward the maxillary incisors. This has been proposed to change the inclination and position of teeth, affect mandibular position, and increase loading on the craniomandibular complex.

An alternative explanation — not mutually exclusive — is that the changes reflect persistent forward posturing of the mandible rather than tooth movement alone. Mornings after wearing an MAD, patients may have difficulty returning the mandible to its normal occlusal position. If not addressed, this can result in an irreversible anterior mandibular position with altered occlusion.

Both mechanisms — tooth movement driven by sustained biomechanical forces, and persistent mandibular repositioning — likely operate simultaneously and cumulatively over years of nightly use.

Predictors of greater occlusal change

Not all patients experience the same degree of change. Research published in the Journal of Clinical Sleep Medicine (Maruyama et al.) found that overjet reduction of 1 mm or more was associated with treatment duration, use frequency, and degree of mandibular advancement. The number of teeth was also a factor — patients with fewer maxillary teeth showed greater overjet reduction. Longer treatment duration, higher nightly compliance, and greater mandibular advancement all increase the risk of more pronounced occlusal change.

A 2025 study published in BMC Oral Health using 3D digital cast superimposition found that over the treatment period, overjet and overbite decreased, with increased maxillary palatal inclination, distal tooth translation in the anterior and posterior segments, and palatal movement of the anterior segment. Wing appliances showed greater reductions in overjet and overbite, maxillary posterior segment extrusion, and mesio-buccal translation in mandibular segments — suggesting that device design is itself a modifiable risk factor that your treating clinician can take into account when selecting and titrating your appliance.

Mitigation strategies: protecting your bite during long-term MAS use

The evidence supports several practical, clinician-guided strategies that meaningfully reduce the rate and severity of occlusal change. At Smile Solutions, these strategies are built into your personalised treatment plan from the outset.

1. Conservative titration

In most patients with mild to moderate OSA, advancement to 50% of the patient's range of motion is equally effective as 75% titration. Advancing your mandible only as far as required to achieve therapeutic efficacy is the most impactful way to reduce long-term occlusal side effects. Your treating clinician will work with you to find the most conservative effective setting for your appliance.

2. Morning jaw exercises

To reduce risks, it is recommended to perform stretching exercises for a total of one minute every morning after removing the MAD device. The American Academy of Dental Sleep Medicine (AADSM) recommends structured morning jaw exercises as first-line management for bite changes. These include moving the mandible against resistance both vertically and laterally, and stretching the mandibular range of motion assisted by the fingers, targeting the masticatory muscles. They have been shown to decrease discomfort and improve adherence to oral appliance therapy.

Your clinician will demonstrate these exercises and tailor them to your specific needs.

3. Morning occlusal guide (AM aligner)

For patients with persistent morning malocclusion, a morning occlusal guide (MOG) — a small thermoplastic device worn for 5–10 minutes after removing the MAS — can guide the condyle back to its habitual position. Morning occlusal guides are considered first-line treatment for decreased overjet and overbite and are widely used in clinical practice.

4. Structured dental monitoring

Given that OSA may require lifelong oral appliance use, thorough customised follow-up is essential to detect possible side effects on the craniofacial complex. Patients should also be adequately informed about these possible changes, particularly those in whom larger or less favourable occlusal changes are anticipated.

At Smile Solutions, your regular dental review appointments include bite assessment, dental cast or digital scan comparison over time, TMJ palpation, and review of morning symptom diaries. These check-ins are the clinical mechanism by which progressive changes are detected early, before they become clinically significant or irreversible.

(For a detailed explanation of the diagnostic tools used to monitor jaw and bite changes, see our guide on [How TMD, Bruxism, and Sleep Apnoea Are Diagnosed: From Clinical Exam to Sleep Study].)

Device maintenance: protecting your investment

Daily and weekly cleaning protocol

Bacterial buildup is the most significant risk of inadequate mouthguard hygiene. Your mouth naturally contains millions of bacteria, and during sleep, saliva production decreases, creating conditions that favour bacterial growth on your device.

The recommended cleaning protocol is:

1. Daily: Rinse the device immediately upon removal each morning. Clean with a soft-bristled toothbrush and mild, non-abrasive soap or a dedicated oral appliance cleaner.
2. Weekly: Soak in a dental appliance cleaning solution or diluted white vinegar for 20–30 minutes to remove biofilm and mineral deposits.
3. Storage: Store in a clean, dry container that is vented to allow air circulation. Avoid direct sunlight or heat, which can warp or damage the material.
4. Avoid: Toothpaste (abrasive; scratches the device surface and creates bacterial harbourage sites), hot water (can warp thermoplastic components), and bleach-based products.

Clean your teeth carefully before putting the device in your mouth. With good dental care, the MAS does not affect your teeth — but any existing gum problem or tooth decay could worsen because the device covers the teeth and gums, reducing saliva contact.

Device lifespan and replacement cycles

Device longevity correlates directly with maintenance quality. Well-maintained sleep apnoea treatment devices can last 3–7 years; poorly maintained appliances may require replacement within 12–18 months.

Several factors accelerate device wear:

• Bruxism: Nightly tooth grinding places significantly greater mechanical stress on the device material and can substantially shorten lifespan, particularly for thermoformed dual-laminate appliances.
• Material type: 3D-printed nylon appliances (such as those fabricated at Smile Solutions using CAD/CAM technology) generally demonstrate better durability than soft thermoplastic devices, resisting deformation and surface degradation more effectively over time.
• Occlusal change: As your bite shifts over years of MAS use, the original fit of the device changes. A device that no longer accurately fits your dentition will be less effective therapeutically and may apply uneven forces, potentially accelerating further occlusal change.

If you notice significant wear or the appliance no longer fits as it used to, it may be time for a replacement — your Smile Solutions clinician will guide you through that process.

(For a detailed comparison of device materials and designs, see our guide on [Occlusal Splints vs. Mandibular Advancement Splints for Bruxism: Choosing the Right Device].)

The role of regular dental monitoring in long-term MAS therapy

What monitoring should include

A structured long-term monitoring programme for MAS patients should cover the following at regular intervals (typically every 6–12 months):

When to escalate

The evidence makes clear that many significant dental changes will continue to progress over the duration of treatment, and because MAS treatment of OSA continues indefinitely, clinicians need to be aware of these changes and discuss them openly with patients.

Red flags that warrant urgent clinical review include:

• Persistent morning bite change that does not self-resolve within 30–60 minutes
• New or worsening TMJ pain, clicking, or locking (see our guide on [What Is TMD? Understanding Temporomandibular Joint Disorders])
• Visible tooth movement or spacing changes
• Device no longer seating correctly on your teeth
• Return of snoring or sleep apnoea symptoms, which may indicate the device has been rendered ineffective by occlusal drift

Over a long time, your lower jaw position can sometimes shift and sit forward from its original position. If you notice any change in how your teeth meet, stop wearing the device and contact the dental sleep department. Our team at Smile Solutions is always available to help.

Balancing risk and benefit: the clinical perspective

These side effects need to be placed in context. Side effects of MAS use over long periods are common but mild and well tolerated by most patients, and dentofacial changes are negligible in shorter-term studies. The more significant changes documented by Pliska et al. and confirmed in subsequent systematic reviews emerge over the 5–11 year timeframe.

The alternative — untreated obstructive sleep apnoea — carries far greater health risks: cardiovascular disease, stroke, cognitive impairment, and metabolic dysfunction. (See our guide on [Obstructive Sleep Apnoea: What It Is, Why It Happens, and Why Your Dentist Can Help] for a full discussion of OSA's systemic health consequences.)

The clinical consensus, reflected in guidelines from the American Academy of Sleep Medicine (AASM) and the American Academy of Dental Sleep Medicine (AADSM), is that the occlusal side effects of MAS therapy are manageable with appropriate monitoring and do not, in most patients, outweigh the substantial therapeutic benefits. The risk of developing pain and functional impairment of the temporomandibular complex appears limited with long-term MAS use.

What is not acceptable is proceeding with MAS therapy without patients fully understanding that progressive bite changes are an expected feature of decade-long treatment, not an unexpected complication. At Smile Solutions, ensuring every patient has a genuinely informed picture before treatment begins is part of the standard of care.

Key takeaways

• Transient side effects (jaw soreness, excess salivation, dry mouth, morning bite changes) are common in the first weeks of MAS therapy and typically resolve with acclimatisation and device adjustment.
• Progressive occlusal changes — measurable reductions in overbite and overjet — are an expected feature of long-term MAS use, confirmed across multiple systematic reviews and an 11-year longitudinal study. These changes do not plateau.
• Conservative titration (advancing the mandible only as far as needed for therapeutic efficacy) and daily morning jaw exercises are evidence-based strategies that reduce the rate of occlusal change.
• Morning occlusal guides (AM aligners) are a first-line clinical tool for managing morning malocclusion and preventing cumulative bite drift.
• Regular dental monitoring — dental cast comparison, TMJ assessment, and device inspection at 6–12 monthly intervals — is the primary mechanism by which side effects are detected early and managed before they become irreversible.
• Device maintenance (daily cleaning, weekly deep cleaning, proper storage, and timely replacement every 3–7 years) protects both your oral health and the therapeutic efficacy of your appliance.

Conclusion

Mandibular advancement splint therapy is a highly effective, evidence-based treatment for OSA, snoring, and bruxism — but it is a lifelong commitment that requires an equally long-term approach to care. The science is clear: progressive occlusal changes accumulate over years of nightly use, device materials degrade, and your jaw and bite require active monitoring to preserve both oral health and therapeutic effectiveness.

What separates excellent MAS care from merely adequate care is the quality of the monitoring programme surrounding the device. At Smile Solutions, long-term MAS management is built into your treatment model from the very first appointment — not added as an afterthought when problems arise. Our specialists, practising from our heritage home in the Manchester Unity Building in the heart of Melbourne's CBD, are committed to delivering world-class care across every stage of your treatment journey.

If you are currently wearing a mandibular advancement splint and have not had a formal bite assessment in the past 12 months, that review is overdue. If you are considering MAS therapy for the first time, understanding this long-term picture before you begin is part of making a genuinely informed treatment decision — and we would be glad to walk you through it.

(For a complete overview of the patient journey at Smile Solutions — from initial assessment through to long-term management — see our guide on [Getting Your Mandibular Advancement Splint at Smile Solutions Melbourne: A Step-by-Step Patient Guide].)

Smile Solutions has been providing comprehensive dental care from Melbourne's CBD since 1993. Located at the Manchester Unity Building, Level 1 and 10, 220 Collins Street, Smile Solutions brings together 60 or more clinicians — including 25 or more board-registered specialists — who have cared for over 250,000 patients. No referral is required to book a specialist appointment. Call 13 13 96 or visit smilesolutions.com.au to arrange your TMD and sleep treatment consultation.

References

• Pliska BT, Nam H, Chen H, Lowe AA, Almeida FR. "Obstructive Sleep Apnea and Mandibular Advancement Splints: Occlusal Effects and Progression of Changes Associated with a Decade of Treatment." Journal of Clinical Sleep Medicine, 2014;10(12):1285–1291. https://doi.org/10.5664/jcsm.4278

• Chen Y et al. "Dentoskeletal Changes of Long-Term Oral Appliance Treatment in Patients with Obstructive Sleep Apnea: A Systematic Review and Meta-Analysis." Journal of Prosthodontics, 2025. https://doi.org/10.1111/jopr.13946

• Rao S et al. "Dental and Skeletal Changes of Long-Term Use of Mandibular Advancement Devices for the Treatment of Adult Obstructive Sleep Apnea: A Systematic Review and Meta-Analysis." Sleep Medicine, 2024. https://pubmed.ncbi.nlm.nih.gov/39174171/

• Alessandri-Bonetti G et al. "Dental and Skeletal Long-Term Side Effects of Mandibular Advancement Devices in Obstructive Sleep Apnea Patients: A Systematic Review with Meta-Regression Analysis." European Journal of Orthodontics, 2019;41(1):89–96. https://doi.org/10.1093/ejo/cjy043

• Takizawa C et al. "The Impact of Oral Appliance Therapy and Mandibular Advancement Devices on Jaw Function Symptoms in Sleep Apnea: A Narrative Review." Journal of Oral and Maxillofacial Anesthesia, 2024. https://joma.amegroups.org/article/view/6727/html

• Cunha TCA et al. "Side Effects of Mandibular Advancement Splints for the Treatment of Snoring and Obstructive Sleep Apnea: A Systematic Review." Dental Press Journal of Orthodontics, 2018. https://pmc.ncbi.nlm.nih.gov/articles/PMC6150709/

• Robertson C, Herbison P, Harkness M. "Dental and Occlusal Changes During Mandibular Advancement Splint Therapy in Sleep Disordered Patients." European Journal of Orthodontics, 2003;25(4):371–376. https://doi.org/10.1093/ejo/25.4.371

• Maruyama T et al. "Predictors of Side Effects with Long-Term Oral Appliance Therapy for Obstructive Sleep Apnea." Journal of Clinical Sleep Medicine, 2018. https://doi.org/10.5664/jcsm.6896

• American Academy of Dental Sleep Medicine (AADSM). "Management of Side Effects of Oral Appliance Therapy." Journal of Dental Sleep Medicine. https://aadsm.org/journal/special_article_issue_44.php

• Ford ML, Vorona RD, Ware JC. "An Alternative Cause for Long Term Changes with Mandibular Advancement Devices." Journal of Clinical Sleep Medicine, 2015;11(4):501. https://pmc.ncbi.nlm.nih.gov/articles/PMC4365467/

• Guy's and St Thomas' NHS Foundation Trust. "Mandibular Repositioning Appliance (MRA)." Patient Information, 2024. https://www.guysandstthomas.nhs.uk/health-information/mandibular-repositioning-appliance-mra

Frequently asked questions

What is a mandibular advancement splint (MAS)? A device that holds the jaw forward during sleep.

What conditions does MAS treat? Obstructive sleep apnoea, snoring, and bruxism.

Is MAS a short-term or long-term treatment? Long-term — potentially a decade or more.

Is MAS therapy considered invasive? No, it is non-invasive.

How does MAS work? It holds the mandible in a protruded, vertically open position.

What does MAS protrusion do to the airway? It pulls the tongue base forward and stretches pharyngeal soft tissues.

Are MAS side effects divided into categories? Yes, transient and progressive.

What are transient MAS side effects? Jaw soreness, dry mouth, excess salivation, tooth discomfort.

What are progressive MAS side effects? Measurable changes to overbite, overjet, and tooth inclination.

Do transient side effects resolve? Yes, typically within days to weeks.

What is the most commonly reported early MAS side effect? Jaw discomfort.

Why does jaw soreness occur with MAS? Sustained mechanical load on masticatory muscles and TMJ.

Why does excess salivation occur with MAS? The appliance stimulates salivary gland reflexes.

Why does dry mouth occur with MAS? Lips part during sleep, allowing airflow to dry the oral mucosa.

When does excess salivation typically resolve? Within the first month of use.

What is morning malocclusion? A bite that feels "off" immediately after removing the MAS.

Why does morning malocclusion occur? Synovial fluid accumulates in the upper TMJ compartment during wear.

Is morning malocclusion usually permanent? No, it is typically transient and self-resolving.

How long does morning malocclusion typically last? Minutes to up to one hour.

Can morning malocclusion become permanent? Yes, if not actively managed over time.

Do progressive occlusal changes plateau with MAS use? No, they continue with ongoing use.

What landmark study documented long-term MAS occlusal changes? Pliska et al., published in Journal of Clinical Sleep Medicine, 2014.

How many patients were in the Pliska et al. study? 77 patients.

What was the average treatment duration in the Pliska study? 11.1 years.

How much did overbite decrease in the Pliska study? 2.3 mm on average.

How much did overjet decrease in the Pliska study? 1.9 mm on average.

Did the Pliska study find mandibular crowding changes? Yes, a decrease of 1.3 mm on average.

Did mandibular arch width change in the Pliska study? Yes, intercanine and intermolar width increased.

Was the Pliska study finding replicated? Yes, by multiple systematic reviews and meta-analyses.

What did the 2025 Chen et al. meta-analysis find about overbite? Significant decrease of 0.87 mm.

What did the 2025 Chen et al. meta-analysis find about overjet? Significant decrease of 0.86 mm.

How many studies were included in the Chen et al. 2025 meta-analysis? 42 studies.

Did long-term MAS use affect upper incisor angle? Yes, upper incisors retroclined by 2.58 degrees.

Did long-term MAS use affect lower incisor angle? Yes, lower incisors proclined by 2.67 degrees.

Are occlusal side effects influenced by treatment duration? Yes, confirmed by meta-regression analysis.

Does greater mandibular advancement increase side effects? Yes, greater protrusion increases occlusal changes.

Does higher nightly compliance increase occlusal changes? Yes, more frequent use correlates with greater change.

Does having fewer teeth increase occlusal change risk? Yes, fewer maxillary teeth correlates with greater overjet reduction.

Does device design affect occlusal change risk? Yes, wing appliances showed greater reductions in overjet and overbite.

What is conservative titration? Advancing the mandible only as far as needed for therapeutic efficacy.

What advancement level is often equally effective to 75%? 50% of the patient's range of motion.

Is conservative titration the most impactful way to reduce side effects? Yes, per current evidence.

What are morning jaw exercises recommended for? Reducing bite changes and jaw discomfort after MAS removal.

How long should morning jaw exercises be performed? One minute total each morning.

Who recommends morning jaw exercises as first-line management? The American Academy of Dental Sleep Medicine (AADSM).

What is a morning occlusal guide (MOG)? A small thermoplastic device worn after removing the MAS.

What does a morning occlusal guide do? Guides the condyle back to its habitual position.

How long is a morning occlusal guide worn? 5–10 minutes after removing the MAS.

Is a morning occlusal guide considered first-line treatment? Yes, for decreased overjet and overbite.

How often should MAS patients have dental monitoring? Every 6–12 months.

What does MAS monitoring include? Dental cast comparison, TMJ assessment, device inspection, and symptom review.

Should MAS efficacy be reassessed periodically? Yes, including sleep testing to confirm OSA control.

What is a red flag requiring urgent MAS review? Morning bite change not resolving within 30–60 minutes.

Is persistent TMJ pain a red flag? Yes, it warrants urgent clinical review.

Is return of snoring a red flag during MAS therapy? Yes, it may indicate the device has been rendered ineffective.

What is the recommended daily MAS cleaning step? Rinse immediately upon removal and brush with mild non-abrasive soap.

What is the recommended weekly MAS cleaning step? Soak in dental appliance cleaner or diluted white vinegar for 20–30 minutes.

Should toothpaste be used to clean a MAS device? No, toothpaste is abrasive and damages the device surface.

Should hot water be used to clean a MAS device? No, hot water can warp thermoplastic components.

How should a MAS device be stored? In a clean, dry, vented container away from heat and sunlight.

How long can a well-maintained MAS device last? 3–7 years.

How long can a poorly maintained MAS device last? As little as 12–18 months.

Does bruxism shorten MAS device lifespan? Yes, significantly.

Are 3D-printed nylon appliances more durable than thermoplastic ones? Yes, generally more resistant to deformation.

Does untreated OSA carry greater risks than MAS side effects? Yes, including cardiovascular disease, stroke, and cognitive impairment.

Do clinical guidelines support MAS use despite occlusal side effects? Yes, from both AASM and AADSM.

Is the risk of TMJ pain and dysfunction high with long-term MAS use? No, it appeared limited in research.

Is informed consent about progressive bite changes required before MAS therapy? Yes, it is essential.

Should patients stop wearing MAS if bite changes are noticed? Yes, and contact their dental sleep provider promptly.

Where is Smile Solutions located? Level 1 and 10, 220 Collins Street, Melbourne CBD.

Is a referral required to book at Smile Solutions? No referral is required.

What is the Smile Solutions contact number? 13 13 96.

How many clinicians does Smile Solutions have? 60 or more.

How many board-registered specialists does Smile Solutions have? 25 or more.

How many patients has Smile Solutions treated? Over 250,000.

Label facts summary

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Device classification and mechanism

• MAS is classified as a non-invasive device
• MAS holds the mandible in a protruded, vertically open position during sleep
• MAS pulls the tongue base forward and stretches pharyngeal soft tissues
• MAS is indicated for obstructive sleep apnoea, snoring, and bruxism

Side effect profile

• Side effects are categorised as transient or progressive
• Transient side effects include jaw soreness, dry mouth, excess salivation, and tooth discomfort
• Progressive side effects include measurable changes to overbite, overjet, and tooth inclination
• Transient side effects typically resolve within days to weeks
• Excess salivation typically resolves within the first month of use
• Morning malocclusion typically resolves within minutes to up to one hour
• Morning malocclusion can become permanent if not actively managed

Clinical evidence (cited studies)

• Pliska et al. (2014), Journal of Clinical Sleep Medicine: 77 patients, average treatment duration 11.1 years; overbite decreased 2.3 mm, overjet decreased 1.9 mm, mandibular crowding decreased 1.3 mm; intercanine and intermolar width increased
• Chen et al. (2025), Journal of Prosthodontics: meta-analysis of 42 studies; overbite decreased 0.87 mm, overjet decreased 0.86 mm; upper incisors retroclined 2.58°, lower incisors proclined 2.67°
• Alessandri-Bonetti et al. (2019), European Journal of Orthodontics: 21 studies, follow-up 2–11 years; side effects confirmed as time-dependent across all parameters
• Rao et al. (2024), Sleep Medicine: 34 studies; confirmed progressive overjet and overbite reduction with long-term use
• Maruyama et al., Journal of Clinical Sleep Medicine: overjet reduction ≥1 mm associated with treatment duration, use frequency, mandibular advancement, and number of maxillary teeth

Predictors of greater occlusal change

• Greater mandibular advancement increases occlusal change risk
• Higher nightly compliance correlates with greater occlusal change
• Fewer maxillary teeth correlates with greater overjet reduction
• Longer treatment duration correlates with greater change
• Wing appliances showed greater reductions in overjet and overbite than other designs

Mitigation strategies

• Conservative titration to 50% of range of motion stated as often equally effective as 75%
• Morning jaw exercises recommended for one minute daily after MAS removal
• Morning jaw exercises are AADSM first-line management for bite changes
• Morning occlusal guide (MOG) worn 5–10 minutes post-removal is first-line treatment for decreased overjet and overbite

Monitoring recommendations

• Dental monitoring recommended every 6–12 months
• Monitoring includes dental cast comparison, TMJ assessment, device inspection, and symptom review
• Periodic sleep testing recommended to confirm ongoing OSA control
• Red flags for urgent review: morning bite change not resolving within 30–60 minutes, persistent TMJ pain, return of snoring

Device maintenance

• Daily cleaning: rinse immediately upon removal; brush with mild non-abrasive soap
• Weekly cleaning: soak in dental appliance cleaner or diluted white vinegar for 20–30 minutes
• Toothpaste is unsuitable — classified as abrasive to device surfaces
• Hot water is unsuitable — may warp thermoplastic components
• Storage: clean, dry, vented container away from heat and sunlight
• Well-maintained devices last 3–7 years
• Poorly maintained devices last as little as 12–18 months
• Bruxism significantly shortens device lifespan
• 3D-printed nylon appliances generally more durable than thermoplastic alternatives

Organisational facts (Smile Solutions)

• Location: Level 1 and 10, 220 Collins Street, Melbourne CBD
• Contact number: 13 13 96
• No referral required to book
• Stated to have 60 or more clinicians
• Stated to have 25 or more board-registered specialists
• Stated to have treated over 250,000 patients