What is teeth grinding in children, and what causes it?
Teeth grinding, known medically as bruxism, is the involuntary rubbing of the upper and lower teeth against each other, most often during sleep but also during the day.
It is common in children: according to a systematic review, studies report sleep bruxism in 5.9% to 49.6% of children, a gap explained mainly by different diagnostic methods (Machado et al., 2014). The grinding noise can be loud and worrying for parents who hear it at night. Even though it is common, understanding what drives it helps judge whether treatment is needed.
The causes of teeth grinding in children are varied. Key risk factors include stress and anxiety: children facing pressure at school, changes at home or social difficulties may grind as a physical expression of emotional strain. There are also physical factors, such as upper airway problems (enlarged adenoids or tonsils) that cause mouth breathing and change how the jaw muscles work. Research also suggests a possible link with sleep-disordered breathing such as obstructive sleep apnea.
Dental and genetic factors matter too. While baby teeth are being replaced, the bite changes often, and some children grind as they adjust. A poor bite (malocclusion) may lead to unconscious efforts to "fix" how the teeth meet. Children whose parents grind their teeth are at higher risk. Other factors include caffeinated drinks, certain medicines (such as some ADHD medications) and, more rarely, neurological conditions.
Teeth grinding at age 3 and during teething
Grinding during sleep is also common in toddlers, and some parents notice it as early as when the baby teeth come in, while the child gets used to the new teeth and a changing bite. In most cases, grinding at this age is mild and fades with age, and monitoring at regular dental check-ups is enough. An earlier visit makes sense if you see marked wear, if your child complains of pain, or if there is snoring or pauses in breathing during sleep.
Signs of teeth grinding in children
Spotting the signs early allows action while the damage is still minimal.
The grinding noise
The best-known sign is a grinding sound at night, sometimes compared to sandpaper; many parents discover the habit this way. But "silent" grinding also exists, which is why a dental examination matters. Other signs include waking often at night, restless sleep and morning tiredness. At the dentist, flat, shiny wear facets on the biting surfaces reveal mechanical wear.
Other symptoms
Morning headaches (especially at the temples), jaw pain or stiff chewing muscles, and earaches without infection. Some children develop tooth sensitivity to hot or cold as dentin is exposed. In young children, baby teeth are softer and wear can progress faster than in permanent teeth. Severe cases can show tiny cracks in the enamel, chipped teeth or loose fillings.
Grinding at night vs during the day: is there a difference?
Yes: in sleep bruxism the child mostly grinds the teeth side to side at night, while in awake bruxism the child mostly clenches the jaws during the day. The main differences are summarized in the table:
| Criterion | Sleep bruxism | Awake bruxism |
|---|---|---|
| When | During sleep | During the day |
| Movement | Side-to-side grinding | Clenching |
| Main effect | More visible tooth wear | Enlarged chewing muscles, long-lasting jaw pain |
| Outlook | Tends to fade with age | Can persist into adulthood |
| Focus of care | Protecting the teeth, better sleep | Awareness of the habit, stress reduction |
Possible effects of teeth grinding
The effects of grinding go beyond the visible damage to the teeth and can involve the head, neck and jaw.
The most common effect is tooth wear (attrition), which starts in the enamel and can progress to the dentin and even toward the nerve. This leads to sensitivity, shorter-looking teeth and changes in how the teeth meet. In children, the thinner enamel of baby teeth can wear quickly. In severe cases, chipped teeth, enamel cracks and failing fillings can follow.
Chronic grinding can also strain the jaw joint (temporomandibular joint, TMJ) and the chewing muscles: facial pain, limited mouth opening and clicking when eating or yawning. Tension headaches, especially at the temples and forehead, are common in children who grind, and are sometimes mistaken for migraines. A link between grinding and ongoing sleep problems is also possible, with daytime tiredness affecting concentration and behavior; see also jaw pain.
What can happen if teeth grinding is not treated?
Untreated chronic grinding can lead to cumulative damage. One of the most serious is heavy wear of the crowns of the teeth, which can reduce the height of the bite and change how the jaws relate. In permanent teeth, such damage may require crowns, veneers or even root canal treatment when the nerve is exposed.
Untreated grinding can also strain the jaw joint over time, with pain and limited opening. In young children whose jaws are still growing, joint problems may affect growth. Childhood grinding may also be linked to a higher risk of jaw joint problems in adulthood. When grinding is related to sleep-disordered breathing, leaving the breathing problem untreated can cause chronic tiredness and attention difficulties.
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Can teeth grinding in children be prevented?
It is not always possible to prevent grinding completely, especially when genetic or neurological factors are involved, but several strategies reduce the risk and the severity.
01
Address stress
A calm home, a regular, soothing bedtime routine and fewer stressful activities in the evening all help. Talking openly with the child and, when needed, psychological support are part of prevention.
02
Check breathing and bite
Children with enlarged tonsils or adenoids, chronic mouth breathing or signs of sleep apnea should be assessed by a pediatrician or an ENT doctor. An early orthodontic assessment may also help. Avoid caffeine and limit sugar in the evening.
03
Awareness and good sleep
Simple relaxation and breathing exercises help with daytime clenching. A dark, quiet, slightly cool bedroom and no screens for at least an hour before bed support better sleep. At the dental clinic, risk factors can be assessed and a prevention plan built for each child.
Treatment options for teeth grinding in children
Treatment is tailored to the severity of grinding, the child's age, the underlying causes and any damage already present.
1. Careful monitoring
In mild to moderate cases, when grinding causes no significant damage or symptoms, "watchful waiting" is often appropriate: regular check-ups without active treatment. This suits young children in particular while baby teeth are being replaced, since grinding often disappears on its own with age. Better sleep habits, less stress and treating any breathing problem go alongside.
2. A custom night guard
When grinding is more severe or the teeth show marked wear, the main option is a custom night guard (occlusal splint), made in a dental lab from precise impressions. A night guard protects the teeth from further wear but does not stop the grinding or cure bruxism: it separates the jaws and spreads the biting forces over a larger surface. For children it must be comfortable, or the child will not wear it, and it needs regular adjustments as the jaws grow.
3. Psychological or behavioral support
When grinding is driven by significant stress, psychological support or cognitive behavioral therapy (CBT) can help the child cope with anxiety and change unhelpful habits. Biofeedback, in which the child learns to recognize and relax jaw tension, and relaxation techniques may also help.
4. Dental restoration
When long-term grinding has caused significant damage, restoration may be needed: bonding, crowns on severely worn teeth, or root canal treatment if the nerve is exposed. In children this is done cautiously, and final restorations are sometimes postponed until growth is complete. In rare cases of grinding combined with a severe bite problem, orthodontic treatment may be considered to correct the bite, but it is not a treatment for bruxism itself. Botox injections into the chewing muscles are not an accepted treatment for teeth grinding in children: bruxism is not one of Botox's FDA-approved uses, and its effect is only symptomatic and temporary.
Teeth grinding in children: frequently asked questions
Teeth grinding in children, called bruxism, is the involuntary rubbing or clenching of the upper and lower teeth, most often during sleep and sometimes during the day. It is common: according to a systematic review, studies report sleep bruxism in about 6% to 50% of children, depending on how it is diagnosed. It often fades with age.
Teeth grinding in children has several causes that often combine: stress and anxiety, breathing problems during sleep (such as enlarged tonsils or adenoids), the changes in the bite while baby teeth are replaced, and a family tendency, since children of parents who grind are at higher risk. Caffeine and certain medicines, such as some ADHD medications, can also play a role.
Sleep bruxism happens during sleep and mostly involves rhythmic side-to-side grinding that makes the typical noise and tends to wear the teeth more. Awake bruxism happens during the day and mostly involves clenching without much grinding; it is more often linked to jaw muscle tension and jaw pain.
Many children grow out of teeth grinding. Sleep bruxism in children tends to fade with age, especially after puberty, as the nervous system matures and sleep patterns settle. Daytime clenching can persist into adulthood if the stress or habits behind it are not addressed.
A night guard protects a child's teeth from wear but does not stop the grinding or cure bruxism: it separates the jaws and spreads biting forces. In children it is recommended mainly when there is significant tooth wear, and it needs regular adjustments because the jaws are still growing.
Sources
- Machado E et al., Dental Press Journal of Orthodontics, 2014 – View source
- Macedo CR et al., Cochrane Database of Systematic Reviews, 2007 – View source
- U.S. Food and Drug Administration, BOTOX Prescribing Information, 2023 – View source
