What the research says
A 2026 systematic review and meta-analysis combined 16 observational studies with 16,348 participants. People with ADHD had about 2.16 times the odds of bruxism compared with people without ADHD.
Bruxism includes repetitive jaw-muscle activity such as clenching or grinding the teeth. It can happen while awake or during sleep.
The association remained when studies at high risk of bias were removed and when smaller studies were excluded. However, nearly all of the evidence came from children and adolescents. Only one included study focused on adults, so adult conclusions remain limited.
What this may look like
Possible signs include:
- sore or tired jaw
- headaches
- facial pain
- sensitive teeth
- chipped or worn teeth
- noticing daytime jaw clenching
- a partner or family member noticing nighttime grinding
Why ADHD and bruxism might be connected
The review discusses several possible contributors. These are possible mechanisms, not proven causes.
Stress and body tension
Stress can increase muscle tension, including jaw tension. ADHD people may experience higher day-to-day stress, and this may contribute for some people.
Motor regulation
ADHD is associated with differences in some systems involved in starting, stopping, and regulating responses. Researchers have proposed that differences in motor inhibition could be one pathway linking ADHD and jaw-muscle activity, but this has not been established as the cause of bruxism.
Sleep arousal
During sleep, the brain naturally has brief periods of increased arousal. Jaw-muscle activity can increase during these moments, and sleep bruxism often occurs around them. Because ADHD also involves differences in arousal and sleep regulation, researchers have proposed this as another possible pathway.
Medication
Stimulant medication may contribute to bruxism for some people. One large 2024 study of 11,699 adult dental patients found more teeth clenching and headaches among people taking psychostimulants. A separate systematic review found some evidence that methylphenidate may be associated with sleep bruxism, but the quality of evidence was very low.
If clenching begins or gets worse after starting or changing medication, that is useful information to discuss with the prescriber. This does not establish that stimulants caused the symptom.
Daytime and nighttime bruxism
Many studies in the review did not clearly separate awake bruxism from sleep bruxism. That matters because they may need different kinds of support.
Awake bruxism
Awareness can help with daytime clenching. Useful questions include:
- When do I notice my jaw tightening?
- Does it happen during meetings, email, driving, or sustained concentration?
- Can I connect a jaw check to something I already do?
A simple cue: Are my teeth touching or is my jaw tight right now?
Sleep bruxism
A dentist is a good place to start when nighttime grinding is suspected. They can check for tooth wear or damage and may recommend a mouth guard to protect the teeth.
A mouth guard may protect the teeth even if it does not completely stop the grinding itself.
Sleep apnea
Sleep bruxism and obstructive sleep apnea can occur in the same person, but teeth grinding alone does not establish sleep apnea.
Symptoms such as loud snoring, witnessed pauses in breathing, gasping during sleep, substantial daytime sleepiness, or consistently unrefreshing sleep warrant medical assessment.
Related page: No access
Who can help
- Dentist: tooth wear, damage, suspected grinding, mouth-guard discussion
- ADHD prescriber: clenching that appeared or changed after medication changes
- Primary care or sleep clinician: snoring, breathing pauses, gasping, daytime sleepiness, other sleep concerns
- Physical therapist or jaw specialist: persistent jaw pain, tightness, or limited movement
What treatment may include
There is no single treatment because bruxism can have different contributors. Help may include:
- protecting teeth with a mouth guard
- repairing damaged teeth
- increasing awareness of daytime clenching
- changing resting jaw position
- addressing stress when it contributes
- reviewing medications
- physical therapy or jaw exercises
- assessing other sleep problems
What we can and cannot conclude
Supported: ADHD and bruxism are meaningfully associated in the available observational literature.
Not established: ADHD causes bruxism; stimulants explain the whole association; dopamine, stress, sleep arousal, or motor control is the primary mechanism.
Important limitation: only one included study focused on adults, and the review did not provide a women-specific meta-analysis.
ADHD Advocate value
High-value reader angle: jaw clenching, grinding, headaches, and tooth wear can be worth bringing into the broader ADHD health conversation. The practical focus is on noticing patterns, distinguishing daytime from nighttime symptoms, checking medication timing, protecting the teeth, and knowing who to ask for help.
Sources
- Thimoteo, A. C. P., et al. (2026). Association between attention deficit hyperactivity disorder and bruxism: A systematic review. Frontiers in Psychiatry, 17, 1762324. https://doi.org/10.3389/fpsyt.2026.1762324
- Malacarne, A., Jain, S., Barouxis, L., Walterscheid, B., & Finkelman, M. (2024). Attention-deficit hyperactivity disorder and psychostimulant use in patients seeking dental care—Associations with common orofacial pain complaints. Journal of Oral Rehabilitation, 51(6), 947–953. https://doi.org/10.1111/joor.13662
- de Baat, C., et al. (2021). Medications and addictive substances potentially inducing or attenuating sleep bruxism and/or awake bruxism. Journal of Oral Rehabilitation, 48(3), 343–354. https://doi.org/10.1111/joor.13202
- National Institute of Dental and Craniofacial Research. Bruxism (Teeth Grinding): https://www.nidcr.nih.gov/health-info/bruxism