Teeth Grinding in Children and Adolescents: Is It TMD or Sleep-Related Bruxism? product guide

When a parent hears their child grinding their teeth in the night, the instinct is often to dismiss it as a phase - something children simply grow out of. That assumption is understandable, but it is clinically incomplete. Teeth grinding in children and adolescents is not only common; in a significant subset of young patients, it signals an underlying condition that warrants professional evaluation, whether that is a temporomandibular disorder (TMD), sleep-disordered breathing, a psychological stressor, or a combination of all three.

This article addresses one of the most under-discussed topics in dental sleep health: paediatric and adolescent bruxism. It explains how to distinguish between developmental grinding, sleep-related bruxism, and TMD in young patients; why the link to childhood obstructive sleep apnoea (OSA) and sleep-disordered breathing (SDB) is clinically critical; and what age-appropriate management looks like. For parents and clinicians alike, understanding this distinction is the first step toward protecting a child's jaw, teeth, and sleep health over a lifetime.

How Common Is Bruxism in Children? The Prevalence Data

Bruxism is not an adult-only condition. In fact, it is arguably more common in children than in adults.

Sleep bruxism is most common in children, affecting 15% to 40% of children compared to 8% to 10% of adults. However, the reported range varies widely across studies. The reported prevalence of sleep bruxism (SB) in children aged 12 or under varies widely, ranging from 5.9% to 49.6%, while in adolescents, the prevalence of SB also shows variability, from 5% to 52.9%.

This enormous range is not simply statistical noise. Epidemiological investigations report substantial variability in paediatric prevalence rates, largely attributable to heterogeneity in diagnostic methodologies and the absence of universally accepted standardised criteria. When studies rely on parent-reported tooth grinding sounds alone, they may undercount or overcount cases, since about 80% of bruxism episodes, such as teeth grinding, are not accompanied by noise.

Awake bruxism - the clenching or bracing of the jaw during waking hours - is also prevalent. For awake bruxism (AB), prevalence estimates in children and adolescents were 18.1% and 18.9%, respectively. A 2026 study published in Clinical Child Psychology and Psychiatry found that the prevalence of probable awake bruxism was 29.6% in a school-based paediatric sample.

The key takeaway for parents: if your child grinds their teeth, they are far from alone - but prevalence alone does not determine whether intervention is needed.

Is Paediatric Bruxism "Normal"? Understanding the Developmental Context

One of the most important distinctions in paediatric bruxism is between developmental grinding and pathological grinding.

Bruxism in children is so common that it is often considered normal behaviour. It is only when a child has severe tooth damage and reports pain, sleep is interrupted, or the noise is sufficient to disturb parents that it may become a pathological condition.

From a current consensus perspective, according to the 2018 consensus by Lobbezoo et al., bruxism is not considered a disorder in healthy individuals but rather a risk factor for specific clinical outcomes. This distinction matters clinically: not every child who grinds needs treatment, but every child who grinds persistently warrants an assessment to rule out co-existing conditions.

Childhood represents a period of life when sleep patterns develop, and adverse sleep-related outcomes may persist throughout the transition to adolescence and adulthood. Considering that sleep is an essential pillar of health, bruxism-related muscle activities may lead to negative outcomes such as temporomandibular disorders, tooth wear, and headaches.

The clinical concern is not the grinding itself in isolation - it is what the grinding may be signalling.

What Causes Bruxism in Children? A Multifactorial Picture

Psychosocial and Emotional Stressors

The aetiology of bruxism in children and adolescents appears multifactorial, with psychosocial determinants emerging as particularly relevant contributors.

The nature of those stressors shifts with age in a clinically meaningful way:

Younger children: In younger children, bruxism may function as a somatic indicator of dysregulated family emotional climates rather than solely reflecting the child's individual psychological state. Evidence of higher bruxism prevalence among children of divorced parents further underscores the relevance of contextual emotional stressors within the household.
Adolescents: With increasing age, the pattern of associated factors appears to shift toward stressors external to the family system. In adolescents, bruxism has been more strongly linked to academic pressure, bullying victimisation, cyberbullying, childhood maltreatment, and excessive screen use. The stronger association with awake bruxism in adolescent samples suggests that conscious stress processing and behavioural coping mechanisms may become increasingly relevant with cognitive maturation.

A 2025 case-control study published in Scientific Reports confirmed this pattern, finding that adolescents aged 13–17 with sleep bruxism had higher levels of anxiety and depression, and regression analysis indicated that a one-unit increase in anxiety scores may raise the likelihood of bruxism by 2.2 times in adolescents.

ADHD and Neurodevelopmental Conditions

Children with attention deficit hyperactivity disorder (ADHD) represent a particularly high-risk group. A systematic review and meta-analysis published in JAMA Pediatrics found that ADHD was associated with an increased chance of bruxism with an odds ratio of 2.94 (95% CI: 2.12–4.07), independently of the type - sleep bruxism (OR: 2.77) or awake bruxism (OR: 10.64). The association with awake bruxism in ADHD is especially striking and likely reflects shared dopaminergic dysregulation.

Oral Breathing and Upper Airway Factors

One of the most clinically important - and frequently overlooked - risk factors for childhood bruxism is mouth breathing and upper airway obstruction. In one study, the prevalence of sleep bruxism was 27.8% among examined children. Only oral breathing was statistically associated with sleep bruxism, with an odds ratio of 2.71. This connection forms the critical bridge between sleep bruxism and sleep-disordered breathing in children, explored in the next section.

Other Parafunctional Habits

Other oral parafunctional habits such as finger sucking, nail biting, and object biting were common in children with nocturnal bruxism, and researchers have stated that there is a significant relationship between nocturnal bruxism and parafunctional habits. These habits are important to identify during clinical assessment as they may indicate broader oral motor dysregulation.

The Sleep-Disordered Breathing Connection: Why Grinding May Be an Airway Signal

Perhaps the most important clinical insight in paediatric bruxism research is the strong association between sleep bruxism and sleep-disordered breathing (SDB), including obstructive sleep apnoea.

Sleep bruxism is much more than tooth wear, since it is frequently associated with orofacial pain, headaches, and other more severe sleep disorders, such as sleep-disordered breathing.

Within the limitations of a 2024 systematic review published in Oral Diseases, sleep bruxism and sleep-breathing disorders are sleep disorders that frequently appear in paediatric and adolescent populations, where a close relationship could be observed.

The proposed mechanism is physiologically compelling. One theory suggests there is a correlation between bruxing and upper airway obstruction, with obstructive sleep apnoea causing sleep bruxism. Specifically, findings support the hypothesis that rhythmic masticatory muscle activity (RMMA) may be an oromotor activity that helps reinstate airway patency following an obstructive respiratory event during sleep. In other words, the child's jaw may be grinding in response to a partial airway collapse - a protective reflex that restores breathing.

A 2025 study published in Sleep and Breathing investigated this temporal relationship directly, conducting a retrospective review of 72 paediatric polysomnography (PSG) records of children aged 6–17 diagnosed with OSA between 2017 and 2020. The study examined whether apnoea-hypopnoea events temporally preceded or followed bruxism episodes, aiming to clarify potential causal links between sleep bruxism and OSA.

Clinically, this means that a child presenting with habitual nocturnal grinding - especially if they also snore, breathe through their mouth, or are restless sleepers - should be screened for sleep-disordered breathing, not simply fitted with a tooth guard and sent home. (See our guide on Obstructive Sleep Apnoea: What It Is, Why It Happens, and Why Your Dentist Can Help for a full explanation of the airway pathophysiology.)

The adenotonsillectomy evidence is particularly compelling here. In a prospective study of children with obstructive symptoms due to adenotonsillar hypertrophy, the prevalence of bruxism was 25.7% before surgery and 7.1% after it, with the difference significant at p = 0.02.

This study suggests that adenotonsillectomy could improve bruxism significantly in children who have obstructive symptoms due to adenotonsillar hypertrophy. This finding powerfully illustrates that, in children, bruxism driven by airway obstruction may resolve once the obstruction is treated.

When Does Bruxism Become TMD in Children?

TMD is widely considered an adult condition, but the research tells a different story.

Temporomandibular disorders (TMDs) are a group of multifactorial conditions affecting the temporomandibular joints (TMJs), masticatory muscles, and associated structures, and are identified as the main cause of non-dental orofacial pain in children and adolescents.

TMD prevalence in children and adolescents ranged from 16.9% to 40% through clinical examination, with painful TMD rates ranging from 16.2% to 25.5%. The most frequent diagnoses were myofascial pain, myalgia, arthralgia, and disc displacement with reduction.

TMD are generally observed in individuals between the ages of 20 and 40 years, but have also been described in children and adolescents - and are still not widely detected and treated in routine practice. This underdetection is a significant clinical problem, because early diagnosis is essential in order to limit effects on growth, development, and quality of life.

Key Distinctions: Developmental Grinding vs. TMD vs. Sleep Bruxism

The following table summarises the clinical distinctions clinicians and parents should understand:

Feature	Developmental Grinding	Sleep-Related Bruxism	TMD in Children
Typical age	2–6 years (primary dentition)	Any age; peaks 8–13	Adolescence; increasing with puberty
Primary driver	Normal eruption/occlusal development	Sleep arousal, airway, stress	Psychosocial, mechanical, systemic
Key symptoms	Audible grinding, no pain	Audible grinding, morning jaw fatigue, headache	Jaw pain, clicking, limited opening, headache
Associated conditions	Usually none	OSA/SDB, ADHD, anxiety	Stress, parafunctional habits, trauma
Tooth wear	Mild, on primary teeth	Can be significant	Variable
Treatment urgency	Monitor and reassure	Investigate for airway; consider management	Requires clinical evaluation
Spontaneous resolution	Common	Possible; less likely if airway-driven	Less predictable

Temporomandibular disorders in children and adolescents are common and can mostly be characterised as mild and transient. Bruxism, occlusal discrepancies, and orthodontic therapy are no longer considered as primary or perpetuating aetiologic factors for TMD

a significant shift from older thinking that blamed malocclusion for causing TMD. This means that finding a "bad bite" in a grinding child is not a diagnosis; it is an observation that must be contextualised within a comprehensive clinical picture.

(For a full explanation of how bruxism and TMD interact as bidirectional conditions in adults and adolescents, see our guide on The TMD–Bruxism–Sleep Apnoea Connection: How Jaw, Teeth, and Airway Problems Are Linked.)

Red-Flag Symptoms: When Should a Child Be Assessed?

Not all childhood grinding requires intervention. The following symptom clusters should prompt a professional evaluation:

Refer for assessment if a child or adolescent presents with two or more of:

Habitual nocturnal grinding audible to parents most nights
Morning jaw soreness, headaches, or facial pain
Snoring, mouth breathing, or observed breathing pauses during sleep
Daytime fatigue, difficulty concentrating, or behavioural changes
Visible tooth wear, flattened cusps, or dentine exposure
Jaw clicking, locking, or limited mouth opening
Recurrent earaches without confirmed ear infection
Diagnosis of ADHD, anxiety disorder, or other neurodevelopmental condition

Sleep studies have shown some features associated with bruxism in children, such as night sweating, restless sleep, somniloquy, snoring, breathing problems, nightmares, daytime naps, and poor sleep quality and duration. Any cluster of these features warrants a multidisciplinary evaluation.

(See our guide on Recognising the Signs: When Jaw Pain, Headaches, Snoring, and Grinding Mean You Need Assessment for a full symptom-mapping resource.)

Age-Appropriate Management Strategies

The Conservative-First Principle

For the time being, conservative management approaches remain the most appropriate first-line treatment option for TMDs in the paediatric population. This is not simply caution for caution's sake - it reflects the reality that TMD management is not currently validated for children and adolescents, and noninvasive and reversible care should be preferred.

Addressing the Underlying Driver

The most evidence-supported intervention for airway-driven paediatric bruxism is treating the airway obstruction. A link has been made between bruxing and tonsillar hypertrophy, which is strongly correlated to upper airway obstruction. Adenotonsillectomy surgery has been shown to improve bruxism in some children.

For children with confirmed sleep-disordered breathing who are not candidates for adenotonsillectomy, sleep bruxism management should include controlling orofacial and dental consequences and assessing for any other comorbidity, with management options including occlusal splints, oral appliances (mandibular advancement), and rapid maxillary expansion.

An important caution: obstructive sleep apnoea is a contraindication to the use of an occlusal splint, as occlusal splints can worsen obstructive sleep apnoea. Patients with sleep bruxism and obstructive sleep apnoea who need protection for their teeth should use a mandibular advancement device. This principle applies in children as much as in adults - using a standard upper occlusal splint in a child with undiagnosed OSA can worsen their airway obstruction. (See our guide on Occlusal Splints vs. Mandibular Advancement Splints for Bruxism: Choosing the Right Device for a full explanation of why device selection matters.)

Psychological and Behavioural Interventions

For bruxism driven by anxiety, stress, or psychosocial factors, behavioural strategies form the cornerstone of management. These include:

Sleep hygiene education: Sleep hygiene is recommended as a first-line therapy for bruxism in children and adolescents.
Stress reduction and cognitive-behavioural approaches: Particularly relevant for adolescents with anxiety-driven awake or sleep bruxism
Family-level intervention: Given the evidence linking parental stress and family dynamics to childhood bruxism, addressing the family environment may be as important as addressing the child directly

Dental Monitoring

Even when active treatment is deferred, regular dental monitoring is essential to track tooth wear progression, particularly in primary canine teeth. Rios et al. reported that primary canine teeth exhibited the most common and severe wear and that there was a statistically significant association between bruxism and wear on canine teeth.

The Multispecialist Approach

A multispecialist approach - including dentists, sleep specialist physicians, and psychologists - is essential in the diagnosis and management of these frequently associated conditions in paediatric patients. No single clinician should be managing paediatric bruxism in isolation. At Smile Solutions Melbourne, this integrated approach - combining dental sleep medicine expertise with collaboration with sleep physicians and allied health professionals - is central to how we assess and manage complex paediatric presentations.

Key Takeaways

Paediatric bruxism is highly prevalent: The prevalence of sleep bruxism in children and adolescents ranges from 5% to 50% depending on the age range and diagnostic method used.
Bruxism in children is often an airway signal: A significant proportion of childhood sleep bruxism is driven by sleep-disordered breathing and upper airway obstruction. Treating the airway - not just the teeth - can resolve the grinding.
TMD is not exclusively an adult condition: TMDs in children and adolescents are prevalent and multifactorial conditions, mainly of muscular origin, presenting more frequently in adolescents and females.
Device selection is critical: In any child with suspected sleep-disordered breathing, an occlusal splint must not be used without airway screening, as it can worsen airway obstruction.
The conservative-first principle applies universally: In children and adolescents, reversible, non-invasive management - addressing sleep hygiene, stress, airway, and dental monitoring - is the appropriate starting point before any appliance therapy.

Conclusion

Teeth grinding in children is common enough to be normalised, but clinically significant enough to warrant a careful, individualised assessment when it persists or is accompanied by other symptoms. The distinction between developmental grinding, sleep-related bruxism, and TMD in young patients is not always straightforward - but it matters profoundly for treatment planning. Most importantly, paediatric bruxism is frequently a window into the airway: a child who grinds their teeth at night may be doing so because their brain is protecting their breathing.

At Smile Solutions Melbourne, our approach to TMD, bruxism, and sleep health is built on the principle that these conditions are interconnected and must be assessed as a whole. For young patients presenting with grinding, this means looking beyond the teeth to the jaw, the airway, the sleep architecture, and the psychosocial environment. Whether you are a parent concerned about your child's nocturnal grinding, or a clinician seeking a second opinion on a complex adolescent case, the pathway to effective management begins with an accurate, integrated assessment.

For related reading, explore our guides on Bruxism Explained: Causes, Types, and the Hidden Dangers of Teeth Grinding, The TMD–Bruxism–Sleep Apnoea Connection, and How TMD, Bruxism, and Sleep Apnoea Are Diagnosed: From Clinical Exam to Sleep Study.

Smile Solutions has been providing 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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