Obstructive Sleep Apnoea: What It Is, Why It Happens, and Why Your Dentist Can Help product guide

Frequently Asked Questions

What is obstructive sleep apnoea (OSA): A sleeping and breathing disorder causing recurrent airflow arrest during sleep

Is OSA a mechanical problem: Yes, the airway physically collapses

Is OSA a brain signalling problem: No, that is central sleep apnoea

What causes airway collapse in OSA: Partial or total collapse of upper airway soft tissues

Does the pharyngeal airway have bony support: No, it has no skeletal framework

What holds the airway open during waking hours: Muscle tone and structural geometry

Why does the airway collapse during sleep: Muscles relax, reducing tone that keeps the airway open

What is an apnoea event: Breathing completely stops or drops below 10% of normal airflow

What is a hypopnoea event: Airflow reduces by 30% or more for at least 10 seconds

How long must an event last to be classified as apnoea or hypopnoea: At least 10 seconds

Does OSA always wake you fully: No, arousals are brief and rarely remembered

What is the AHI: Apnoea-Hypopnoea Index, measuring breathing disruptions per hour of sleep

What AHI score is considered normal: Below 5 events per hour

What AHI score indicates mild OSA: 5 to 14 events per hour

What AHI score indicates moderate OSA: 15 to 29 events per hour

What AHI score indicates severe OSA: 30 or more events per hour

Who sets the OSA severity classifications used clinically: The American Academy of Sleep Medicine (AASM)

Can OSA be very frequent: Yes, some severe cases involve 60 or more events per hour

Is AHI a perfect diagnostic metric: No, it has recognised limitations

What does AHI fail to account for: Duration of apnoea and body position during events

What supplement to AHI do clinicians use: Oxygen desaturation indices and arousal frequency

What is a normal blood oxygen saturation level: 96–97% at sea level

What oxygen level is considered a mild desaturation: Not less than 90%

What oxygen level is considered a moderate desaturation: 80–89%

What oxygen level is considered a severe desaturation: Below 80%

How common is OSA in Australia: Affects approximately 20% of the population at AHI above 15

How common is simple snoring in adults: Affects approximately 30% of the adult population

What percentage of men had moderate-to-severe OSA in the Australian MAILES study: 14%

What proportion of OSA sufferers are undiagnosed: Approximately 9 in 10

How many adults globally are affected by mild OSA: Approximately 936 million aged 30–69

How many adults globally have moderate OSA: Approximately 425 million

What is the economic impact of OSA in Australia: A 10% reduction in OSA prevalence could gain over AU$25 billion in GDP

Is OSA more prevalent in men: Yes, prevalence is higher in men

Does OSA prevalence increase with age: Yes, it is higher in older people

What is the largest structure in the upper airway: The tongue

What happens to the tongue during sleep in OSA: It falls backward, potentially occluding the pharynx

What role does the mandible play in OSA: Its position determines how far back the tongue and soft tissues sit

Does a receding lower jaw increase OSA risk: Yes, it positions soft tissues further back toward the airway

What is retrognathia: A smaller or recessed lower jaw

Does retrognathia increase OSA risk: Yes, it narrows the airway

Does a high-arched palate affect OSA risk: Yes, it reduces nasal airway space

What is scalloped tongue: Indentations along the sides of the tongue from pressing against teeth

Does scalloped tongue indicate OSA risk: Yes, it can suggest restricted airway space during sleep

Can bruxism be linked to OSA: Yes, teeth grinding is often linked to sleep apnoea

Why does bruxism occur in OSA: It may be a defence mechanism to activate jaw muscles and reopen the airway

What is the hyoid bone: A floating bone at the base of the tongue with no direct skeletal attachment

How many muscles attach to the hyoid bone: Eleven muscles

What does the hyoid bone connect: The mandible, pharynx, and cervical spine

Does hyoid position affect airway patency: Yes, it has a vital role in maintaining upper airway dimension

How does mandibular position affect the hyoid: Changes in mandibular position relate to changes in hyoid position

What cardiovascular condition is strongly linked to OSA: Arterial hypertension

What is the OSA prevalence in patients with hypertension or heart disease: 40% to 80%

Does untreated OSA increase cardiovascular risk: Yes, nearly double the risk of cardiovascular disease and stroke

What nocturnal blood pressure pattern indicates moderate-to-severe OSA: Non-dipping pattern, where blood pressure reduction is less than 10%

What percentage of OSA patients show non-dipping blood pressure: Approximately 84%

Does OSA cause oxidative stress: Yes, through repeated hypoxia and reoxygenation cycles

Does OSA contribute to insulin resistance: Yes, intermittent hypoxia impairs glucose metabolism and insulin signalling

Is OSA associated with type 2 diabetes: Yes

Is OSA associated with depression: Yes

Does OSA affect cognitive function: Yes, it impairs memory consolidation and executive function

Is OSA linked to increased dementia risk: Yes, chronic sleep fragmentation elevates long-term dementia risk

Does OSA affect workplace performance: Yes, it increases missed workdays and job-related accident risk

Does OSA increase motor vehicle accident risk: Yes

Can a dentist diagnose OSA: No, diagnosis requires a sleep study

What is required to diagnose OSA: A sleep study, either polysomnography or home sleep testing

Can a dentist screen for OSA: Yes, using validated questionnaires and oral examination

Can a dentist refer for OSA sleep studies: Yes

Can a dentist fabricate mandibular advancement splints: Yes, following a confirmed OSA diagnosis

What is a mandibular advancement splint: An oral appliance that holds the lower jaw in a forward position during sleep

How does a mandibular advancement splint open the airway: By advancing the jaw, it moves the tongue and soft tissues forward

What airway region does mandibular advancement most enlarge: The lateral dimension of the velopharyngeal region

Are mandibular advancement devices comparable to CPAP for blood pressure reduction: Yes, studies show comparable efficacy

What is CPAP: Continuous positive airway pressure, a primary OSA treatment device

Is CPAP the only treatment for OSA: No, mandibular advancement splints are a recognised alternative

Does Smile Solutions offer OSA consultations: Yes

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

How many clinicians does Smile Solutions have: 60 or more clinicians

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

How long has Smile Solutions been operating: Since 1993

Does Smile Solutions require a referral for specialist appointments: No referral required

What is the Smile Solutions contact number: 13 13 96

Smile Solutions Guide to Obstructive Sleep Apnoea: What It Is, Why It Happens, and Why Your Dentist Can Help

At Smile Solutions, Melbourne's comprehensive dental centre, we think of oral health as something that extends well beyond teeth and gums. Most people know obstructive sleep apnoea (OSA) as a snoring problem — something managed with a CPAP machine prescribed by a GP or sleep physician. What far fewer people realise is that OSA is fundamentally a structural problem involving the airway, the jaw, the tongue, and the soft tissues of the throat. That makes it, in part, a dental concern — and a dentist with training in sleep medicine is often the first clinician positioned to recognise it, assess it, and treat it.

This article explains what OSA actually is at a physiological level, how its severity is measured, what it does to your body over time, and why the anatomy of your mouth and jaw sits at the centre of the condition. That connection is the foundation for understanding why mandibular advancement splint therapy works, and why an integrated dental and medical approach to OSA produces better outcomes than either discipline working in isolation.

What is obstructive sleep apnoea?

Obstructive sleep apnoea is a sleeping and breathing disorder characterised by frequent, recurrent reduction or arrest of airflow during sleep, caused by partial or total collapse of the airways. The word "obstructive" is key: unlike central sleep apnoea — where the brain fails to send the correct signals to the breathing muscles — OSA is a mechanical problem. Your airway physically closes off.

OSA involves recurrent complete (apneas) and partial (hypopneas) upper airway obstructive events, producing intermittent hypoxemia, autonomic fluctuation, and sleep fragmentation. Each time your airway collapses, oxygen levels in the blood fall, carbon dioxide builds up, and the brain triggers a brief arousal to restore muscle tone and reopen the throat. You rarely wake fully and will often have no memory of these events — yet they may occur dozens or even hundreds of times per night.

The pharyngeal airway is rather unique in structure, being completely devoid of any skeletal framework, which leaves it highly susceptible to collapse of its surrounding soft tissues. This is the core anatomical vulnerability that underlies OSA: your throat has no bones to hold it open. It depends entirely on muscle tone and structural geometry — both of which are directly influenced by jaw and tongue position.

How common is OSA in Australia?

OSA is far more prevalent than most people — and many clinicians — appreciate.

Prevalence across the general population runs at 7–30%, depending on the severity classification used, and is higher in men and older people. OSA defined as an apnoea hypopnoea index greater than 15 events per hour affects approximately 20% of the population, while simple snoring affects around 30% of adults. When OSA is defined as AHI ≥ 5 combined with symptoms such as excessive daytime sleepiness, prevalence sits at 2–5% of the general middle-aged population.

The Australian MAILES study found that 14% of men had moderate-to-severe OSA, while 2% had OSA with excessive daytime sleepiness. And the condition is massively under-diagnosed: as many as 9 in 10 people who have OSA don't know they have it.

Globally, approximately 936 million adults aged 30–69 are affected by mild OSA, while about 425 million have moderate forms. The economic burden in Australia is substantial — a 10% reduction in OSA prevalence and its comorbidities would generate more than AU$25 billion in gross domestic product over the working lifetime of the affected population, which gives some sense of the scale of what goes unaddressed.

Understanding the AHI: how OSA severity is measured

The primary diagnostic and severity metric for OSA is the Apnoea-Hypopnoea Index (AHI) — a number generated from a sleep study that quantifies how often your breathing is disrupted per hour of sleep.

The AHI counts two types of events:

• Apneas: breathing completely stops or drops to less than 10% of normal airflow for at least 10 seconds.
• Hypopneas: partial blockages causing shallow breathing, defined as a reduction in airflow of 30% or more for at least 10 seconds.

OSA severity classifications (AASM guidelines)

Per the American Academy of Sleep Medicine (AASM), OSA severity is graded by AHI: mild with an AHI of 5 to less than 15, moderate with an AHI of 15 to 30, and severe with an AHI above 30. The AHI is the only severity indicator currently accepted by scientific societies, valued because it is straightforward to calculate and gives an objective count of apnoeic and hypopnoeic events.

Some people with severe sleep apnoea experience 60 or more events per hour — meaning their breathing is disrupted roughly once every minute throughout the night.

The AHI is useful but imperfect. It treats apneas and hypopneas as equivalent events, when their physiological effects can differ considerably. It also ignores the duration of individual apnoeic events and the patient's body position during them. Clinicians increasingly supplement AHI with oxygen desaturation indices and arousal frequency to get a fuller picture of disease burden. At sea level, normal blood oxygen saturation is 96–97%. Dips to no lower than 90% are generally considered mild; 80–89% is moderate; below 80% is severe.

The pathophysiology of OSA: why the airway collapses

Understanding why your airway collapses during sleep — but not during waking hours — is central to understanding why OSA is both a medical and a dental concern.

During sleep, the muscles of the upper airway relax. In people with sleep apnoea, that relaxation, combined with a narrowed airway, is enough to interrupt breathing. The structures most directly involved are:

• The tongue — the largest structure in the upper airway. When muscle tone drops, it falls backward and can partially or completely block the pharynx.
• The soft palate and uvula — which can prolapse into the airway during inspiration when surrounding muscles lose tone.
• The lateral pharyngeal walls — soft tissue walls with no bony support that can collapse inward.
• The mandible — whose position directly determines how far forward or backward the tongue and associated soft tissues sit.

A receding lower jaw positions the tongue and soft tissues further back, making obstruction more likely. This is the anatomical link between jaw structure and OSA, and it is precisely what places your dentist in a clinically relevant position.

Jaw posture also influences airway size more directly. Opening the jaw slightly increases tongue space in the oral cavity. When the mandible drops and rotates backward during sleep, that space shrinks and the airway narrows.

The physiological cascade following each apnoeic event goes well beyond disrupted sleep. Repeated cycles of hypoxia and reoxygenation drive oxidative stress, systemic inflammation, and endothelial dysfunction — key mechanisms in atherogenesis. Chronic sympathetic activation contributes to sustained hypertension and increased blood pressure variability. These same pathways promote insulin resistance, dyslipidaemia, hypercoagulability, and arterial stiffness, increasing the risk of coronary and cerebrovascular events.

The systemic health risks of untreated OSA

OSA is not a benign inconvenience. Its consequences when left undiagnosed or inadequately treated are serious, well-documented, and affect multiple body systems.

Cardiovascular disease

There is high-level evidence of a causal relationship between OSA and arterial hypertension and endothelial dysfunction, as well as higher rates of major adverse cardiovascular events among subgroups of patients with untreated OSA.

OSA prevalence runs as high as 40–80% in patients with hypertension, heart failure, coronary artery disease, pulmonary hypertension, atrial fibrillation, and stroke. Despite this, OSA is frequently underrecognised and undertreated in cardiovascular practice, even among patients who are most vulnerable to its effects.

Meta-analyses link OSA to nearly twice the risk of cardiovascular disease, stroke, and all-cause mortality. Part of the mechanism lies in disrupted blood pressure regulation: a non-dipping nocturnal pattern — where blood pressure fails to fall by at least 10% overnight — indicates moderate to severe OSA and affects approximately 84% of people diagnosed with the condition. This pattern is commonly associated with nocturnal hypertension, an exaggerated morning blood pressure surge, and increased short-term variability during the night.

The 2021 American Heart Association scientific statement identifies OSA as an independent risk factor for cardiovascular morbidity and mortality through these pathways. Both CPAP and mandibular advancement devices have demonstrated comparable efficacy in reducing blood pressure in OSA patients, which speaks to their shared role in addressing sympathetic overactivation.

Metabolic consequences

OSA is associated with cardiovascular disease, type 2 diabetes, and depression, among other comorbidities. The intermittent hypoxia characteristic of OSA impairs glucose metabolism and insulin signalling, creating a bidirectional relationship with metabolic syndrome. Research has also linked sleep apnoea to older age, unemployment, asthma, chronic obstructive pulmonary disease, hypercholesterolaemia, heart attack, heart failure, angina, and post-traumatic stress disorder.

Cognitive and mental health impacts

Compared with people without sleep apnoea, those with the condition show significantly poorer physical, mental, and self-rated health, along with lower subjective wellbeing and impaired concentration and memory. Chronic sleep fragmentation disrupts memory consolidation and executive function, and is increasingly linked to elevated long-term dementia risk. OSA also carries real occupational consequences: it is associated with increased risk of job-related and motor vehicle accidents, more frequent health-related missed workdays, and reduced quality of life overall.

The oral and jaw anatomy of OSA: why this is a dental concern

The upper airway does not exist in isolation. It is bounded anteriorly and inferiorly by the mandible, populated by the tongue, roofed by the hard and soft palate, and its dimensions are directly shaped by the spatial relationships between these structures — all of which fall within your dentist's clinical domain.

Craniofacial risk factors for OSA

Several anatomical features assessed during a routine dental examination are established OSA risk factors:

• A smaller or recessed lower jaw (retrognathia) pushes the tongue and soft tissues backward, narrowing the airway and increasing the risk of obstruction during sleep. A small upper jaw can similarly produce a high-arched palate, reducing space in the nasal airway.
• The size and position of the tongue relative to the airway matter considerably. A larger tongue, or one that sits further back in the mouth, can easily block the airway when lying down.
• Scalloped tongue — indentations along the sides of the tongue — can suggest the tongue has been pressing against the teeth because of restricted airway space during sleep.
• Dry mouth or morning sore throat can indicate mouth breathing during sleep, a common sign that the throat is narrowing or closing.
• Teeth grinding (bruxism) is often linked to sleep apnoea; it is thought to be a defence mechanism in which the jaw muscles activate in an attempt to reopen the airway.

That last point is explored in depth in our guide on The TMD–Bruxism–Sleep Apnoea Connection. The clinical takeaway is that a dentist examining you for bruxism, jaw pain, or worn teeth may be looking at the oral manifestations of undiagnosed OSA.

The hyoid bone–mandible–airway relationship

The hyoid bone is unique to humans — the only bone intimately connected to the pharynx. It is a floating bone at the base of the tongue, suspended between the temporal bones and the sternum by muscles and ligaments, and it is the centre of action for most movements of the pharynx. The hyoid maintains head posture through complex connections between the mandible and the cervical spine.

Its position is determined by eleven muscle attachments. Changes in hyoid position tend to follow changes in mandibular position, and because of its anatomical location, it plays a direct role in maintaining upper airway patency and dimension.

This chain — mandible → hyoid → tongue → pharyngeal airway — explains why advancing the lower jaw forward during sleep, via a mandibular advancement splint, can mechanically open the airway. Oral appliances improve upper airway configuration and prevent collapse by altering jaw and tongue position, holding the lower jaw in a more anterior position. Imaging studies confirm that mandibular advancement enlarges the upper airway, most notably in the lateral dimension of the velopharyngeal region.

What your dentist sees that others may miss

Simple physical examination of anatomic indicators — increased neck circumference, elevated body mass index, modified Mallampati score, and anatomic abnormalities of the oral cavity — allows identification of patients at risk. Most recent international guidelines affirm that the qualified dentist has ideal conditions to screen for sleep-disordered breathing, given that routine appointments already involve close observation of the mouth and surrounding structures.

There is now widespread recognition within sleep medicine of the growing importance of dental sleep medicine and oral appliance therapy in managing adults with OSA. A dentist who understands airway anatomy, recognises bruxism as a potential OSA response, and can identify structural contributors to airway collapse will catch at-risk patients who might otherwise go undiagnosed for years — making your routine dental visit considerably more valuable than most people expect.

Where dental sleep medicine fits in the OSA care pathway

It is worth being clear about what dental sleep medicine is — and what it is not. A dentist cannot diagnose OSA. Diagnosis requires a sleep study: either a full in-laboratory polysomnography or a validated home sleep testing device (see our guide on How TMD, Bruxism, and Sleep Apnoea Are Diagnosed: From Clinical Exam to Sleep Study). In Australia, eligible patients can access Medicare-funded sleep study services to clinically assess and diagnose sleep disorders, including OSA.

What your dentist can do — and what a dentist with specific training in dental sleep medicine is well placed to do — is:

1. Screen for OSA risk using validated questionnaires and oral examination findings
2. Refer appropriately for a sleep study when clinical indicators suggest sleep-disordered breathing
3. Fabricate and titrate custom mandibular advancement splints following a confirmed OSA diagnosis
4. Collaborate with sleep physicians to monitor treatment efficacy via follow-up sleep testing
5. Manage the dental and TMJ implications of long-term oral appliance therapy

Interdisciplinary cooperation is essential for screening, treating, and managing patients with sleep-disordered breathing. Good patient-focused care depends on clear agreement about the role each professional plays.

This collaborative model is why Smile Solutions' approach — combining dental sleep medicine expertise with access to sleep physician collaboration and in-house diagnostic capability — delivers clinical results that neither discipline could achieve working alone. Our experienced specialists work together to ensure your care is both thorough and personalised, from first assessment through to long-term management.

For patients who have already received an OSA diagnosis and are exploring treatment options, our article on Mandibular Advancement Splint vs. CPAP: Which Sleep Apnoea Treatment Is Right for You? provides an evidence-based comparison of the two primary non-surgical therapies.

Key takeaways

• OSA is a mechanical airway problem, not merely a snoring complaint. The pharyngeal airway collapses because it has no bony support — it depends entirely on muscle tone and structural geometry.
• The AHI classifies OSA severity: mild (5–14 events/hour), moderate (15–29), and severe (≥30). The higher the AHI, the greater the systemic health risk.
• Untreated OSA carries serious systemic consequences, including up to double the risk of cardiovascular disease and stroke, metabolic disruption, cognitive impairment, and significantly reduced quality of life.
• Jaw and oral anatomy are central to OSA pathophysiology. Retrognathia, tongue size, palatal height, and mandibular position all directly influence upper airway dimensions — all within your dentist's clinical purview.
• Dental sleep medicine is a legitimate, evidence-supported discipline. A trained dentist can screen for OSA, refer for a sleep study, and fabricate mandibular advancement splints that mechanically open the airway, making the dental practice a genuine access point in the OSA care pathway.

Conclusion

Obstructive sleep apnoea is one of the most prevalent and under-diagnosed conditions in Australia, with consequences that extend well beyond poor sleep. Its pathophysiology is inseparably linked to the anatomy of the jaw, tongue, and upper airway — structures your dentist examines at every routine appointment. Recognising OSA as a condition with a significant oral and dental dimension is not a rebranding exercise; it is an evidence-based clinical reality supported by the American Heart Association, the European Respiratory Society, and sleep medicine guidelines worldwide.

If you're in Melbourne and experiencing jaw pain, teeth grinding, morning headaches, or partner-reported snoring, the path to an OSA diagnosis may well begin in the dental chair. Understanding what OSA is — and why the anatomy of your mouth matters — is the first step toward getting the right assessment and the most appropriate, personalised treatment. We'd encourage you to reach out and book a consultation with our experienced team. World-class care for complex conditions like OSA is available right here in Melbourne's CBD, and it may start with a conversation at your next dental visit.

Explore related articles in this series:

• Recognising the Signs: When Jaw Pain, Headaches, Snoring, and Grinding Mean You Need Assessment
• The TMD–Bruxism–Sleep Apnoea Connection: How Jaw, Teeth, and Airway Problems Are Linked
• Mandibular Advancement Splints Explained: How They Work, Who They're For, and What to Expect
• Does Snoring Always Mean Sleep Apnoea? Understanding Primary Snoring vs. OSA

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+ clinicians — including 25+ 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.

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