Childhood bruxism is a repetitive activity of the masticatory muscles that may involve tooth grinding, clenching, mandibular bracing, or jaw movements. It can occur during sleep (sleep bruxism) or while the child is awake (awake bruxism).
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The identification of potential contributing factors is clinically important because bruxism may coexist with sleep disturbances, headaches, muscle discomfort, abnormal tooth wear, or other oral and systemic findings. However, the presence of bruxism does not necessarily indicate disease or require treatment in every child.
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The causes of childhood bruxism are multifactorial, and the strength of evidence varies considerably among proposed factors.
1. Sleep Disturbances
Sleep-related factors are among the most consistently reported associations with sleep bruxism in children. Insufficient sleep, restless sleep, and other alterations in sleep behavior have been associated with increased likelihood of bruxism.
A systematic review and meta-analysis found associations between childhood bruxism and snoring, restless sleep, inadequate sleep duration, mouth breathing, and other sleep-related behaviors.
Therefore, the clinical history should include questions about sleep quality, duration, snoring, restless sleep, and unusual nocturnal behaviors.
2. Sleep-Disordered Breathing
Sleep-disordered breathing (SDB), including conditions associated with obstructive breathing during sleep, has been repeatedly associated with sleep bruxism.
A systematic review involving children and adolescents found a relationship between sleep bruxism and sleep respiratory disorders, although the authors emphasized that the available evidence does not establish a definitive causal relationship.
Persistent snoring, mouth breathing, witnessed pauses in breathing, restless sleep, or excessive daytime sleepiness should therefore prompt appropriate medical or sleep evaluation rather than assuming that bruxism is an isolated dental problem.
3. Psychological and Psychosocial Factors
Stress, anxiety, and other psychosocial factors may contribute to bruxism, particularly in older children and adolescents.
Evidence suggests that the association is age-dependent. A systematic review found no convincing evidence of an association between psychosocial factors and sleep bruxism in children younger than five years, whereas an association was observed in children aged 6–11 years and adolescents.
Consequently, psychosocial factors should be considered as possible contributors rather than automatically identifying stress or anxiety as the primary cause.
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Family history may also play a role. Recent evidence has identified an association between sleep bruxism in children and bruxism in their parents or guardians.
A 2025 systematic review and meta-analysis reported that children whose parents or guardians had sleep bruxism were more likely to exhibit sleep bruxism themselves. However, the certainty of evidence was rated very low, meaning that these findings should be interpreted cautiously and should not be considered proof of a direct genetic cause.
5. Behavioral and Parafunctional Factors
Some children exhibit repetitive oral behaviors or parafunctional activities that may coexist with bruxism. These behaviors can include persistent clenching, chewing habits, or other repetitive mandibular activities.
A systematic review identified parafunctional behaviors as a moderately associated factor, although the evidence remains heterogeneous.
6. Other Associated Factors
The pediatric literature has also investigated factors such as screen exposure, dietary patterns, family characteristics, personality traits, and environmental influences. Some studies have reported associations, but these findings are not sufficiently consistent to establish them as independent causes.
Current evidence therefore supports a multifactorial model of childhood bruxism, rather than a single etiological mechanism.
📊 Main Factors Associated With Childhood Bruxism
| Factor | Examples | Clinical Relevance |
|---|---|---|
| Sleep disturbances | Restless sleep, insufficient sleep, altered sleep patterns | Frequently associated with sleep bruxism |
| Sleep-disordered breathing | Snoring, mouth breathing, obstructive breathing | Important association requiring appropriate evaluation |
| Psychosocial factors | Stress, anxiety, emotional difficulties | More relevant in older children and adolescents |
| Familial factors | Parental or familial history of bruxism | Association reported, but causality remains uncertain |
| Parafunctional behaviors | Clenching and repetitive oral behaviors | May coexist with or contribute to bruxism |
Tooth wear may be observed in children with bruxism, but it should not be considered diagnostic by itself. Pediatric tooth wear may have multiple causes, and recent evidence indicates that tooth wear is not necessarily a major or specific indicator of sleep bruxism in children.
The diagnosis should therefore integrate the child's history, parental observations, clinical examination, and, when clinically indicated, additional assessment.
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The current understanding of childhood bruxism causes has shifted from a predominantly mechanical or occlusal explanation toward a broader biopsychosocial and sleep-related model. Sleep disturbances and respiratory changes appear particularly relevant, while psychosocial, behavioral, and familial factors may contribute in selected patients.
Importantly, most available pediatric studies are observational, use heterogeneous diagnostic methods, and frequently rely on parental reports. Consequently, associations should not automatically be interpreted as causal relationships.
The contemporary consensus also emphasizes that bruxism represents a type of masticatory muscle activity and should not automatically be classified as a disorder. Its clinical significance depends on the individual patient's symptoms, associated conditions, and potential consequences.
🎯 Clinical Recommendations
▪️ Assess sleep history in children with suspected sleep bruxism, particularly snoring, mouth breathing, restless sleep, and inadequate sleep duration.
▪️ Screen for sleep-disordered breathing when respiratory symptoms accompany nocturnal bruxism.
▪️ Consider psychosocial factors in school-aged children and adolescents, without assuming that stress is the sole cause.
▪️ Ask about familial history of bruxism, recognizing that current evidence demonstrates association rather than definitive genetic causation.
▪️ Do not diagnose bruxism solely from tooth wear; combine history, clinical findings, and relevant symptoms.
▪️ Avoid unnecessary irreversible dental treatment when the child has asymptomatic bruxism without significant clinical consequences.
▪️ Refer for medical, sleep, or psychological assessment when the clinical history suggests a relevant underlying condition.
✍️ Conclusion
Childhood bruxism is multifactorial and cannot generally be attributed to a single cause. Sleep disturbances, sleep-disordered breathing, psychosocial factors, familial influences, and parafunctional behaviors are among the factors most frequently associated with pediatric bruxism.
For dental clinicians, identifying potentially modifiable or clinically significant associated factors is more useful than attempting to identify a single cause. A comprehensive clinical assessment allows children who require further evaluation to be distinguished from those in whom observation and periodic follow-up are appropriate.
📚 References
✔ Lobbezoo, F., Ahlberg, J., Glaros, A. G., Kato, T., Koyano, K., Lavigne, G. J., de Leeuw, R., Manfredini, D., Svensson, P., & Winocur, E. (2013). Bruxism defined and graded: An international consensus. Journal of Oral Rehabilitation, 40(1), 2–4. https://doi.org/10.1111/joor.12011
✔ Lobbezoo, F., Ahlberg, J., Raphael, K. G., Wetselaar, P., Glaros, A. G., Kato, T., Santiago, V., Winocur, E., De Laat, A., De Leeuw, R., Koyano, K., Lavigne, G. J., Svensson, P., & Manfredini, D. (2018). International consensus on the assessment of bruxism: Report of a work in progress. Journal of Oral Rehabilitation, 45(11), 837–844. https://doi.org/10.1111/joor.12663
✔ Leung, A. K. C., Wong, A. H. C., Lam, J. M., & Hon, K. L. (2024). Sleep bruxism in children: A narrative review. Current Pediatric Reviews, 20(2), 139–148. https://doi.org/10.2174/1573396320666230915103716
✔ Melo, G., Dutra, K., Rodrigues, R., Machado, L., & Porporatti, A. L. (2017). Association between children's sleep bruxism and sleep behaviors: A systematic review and meta-analysis. Journal of Dentistry, 66, 12–18.
✔ Serra-Negra, J. M., Paiva, S. M., Flores-Mendoza, C. E., Ramos-Jorge, M. L., & Pordeus, I. A. (2015). Risk factors related to sleep bruxism in children: A systematic literature review. Journal of Indian Society of Pedodontics and Preventive Dentistry, 33(4), 303–306.
✔ Manfredini, D., et al. (2023). Sleep bruxism in children, from evidence to the clinic: A systematic review. Journal of Clinical Medicine, 12, 3660.
✔ Carra, M. C., et al. (2023). Sleep bruxism and sleep respiratory disorders in children and adolescents: A systematic review. Oral Diseases.
✔ Minervini, G., Franco, R., Marrapodi, M. M., Crimi, S., Fiorillo, L., Cervino, G., Bianchi, A., & Cicciù, M. (2024). Sleep bruxism in children main methods of treatment: A systematic review with meta-analysis. Journal of Clinical Pediatric Dentistry, 48(5), 41–50. https://doi.org/10.22514/jocpd.2024.102
✔ Medeiros, L. F., et al. (2025). Association between children's sleep bruxism with that of their parents/guardians: A systematic review and meta-analysis. Sleep Medicine.
✔ Manfredini, D., et al. (2025). Updating the bruxism definitions: Report of an international consensus meeting. Journal of Oral Rehabilitation.
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