Teeth grinding (bruxism) is remarkably common — estimates suggest 8-10% of the population grinds their teeth during sleep, with higher rates in people with anxiety, sleep disorders, and certain medication exposures. Many people grind without knowing it, discovering the consequences through worn tooth surfaces, jaw pain, or a dentist pointing it out.
What bruxism does to teeth and gums
The force generated during bruxism is significantly higher than normal chewing — estimates put it at 250 pounds per square inch or more compared to typical chewing forces of 70-150 psi. Applied repeatedly over years, these forces cause: enamel wear — teeth become flatter, shorter, losing natural shape; front teeth can wear to translucent edges. Tooth fractures — craze lines, cuspal fractures, and in severe cases catastrophic fractures become more likely. Gum recession — lateral forces stress the periodontal ligament and bone, which over time can cause the bone to remodel in ways that lead to gum recession on affected teeth. TMJ issues — the jaw joint bears the loads of bruxism. Chronic grinding contributes to pain, clicking, limited opening, and disc displacement.
What’s driving it
Sleep bruxism is classified as a sleep movement disorder. Stress and anxiety are the most commonly cited drivers, and the association is real — bruxism frequency correlates with stress levels in multiple studies. But stress isn’t the only cause. Certain medications — particularly SSRIs and SNRIs — are associated with bruxism as a side effect. Sleep apnea and other sleep disorders frequently co-occur with bruxism; some research suggests bruxism during sleep may function as an airway-protective mechanism when oxygen saturation drops. Caffeine and alcohol both increase bruxism frequency when consumed close to bedtime.
What helps
A custom-fitted night guard from a dentist is the primary protective intervention — it doesn’t stop bruxism but absorbs forces and protects tooth surfaces. OTC night guards are less effective and can worsen TMJ symptoms in some people. Botulinum toxin (Botox) injections into the masseter muscles are increasingly used for severe bruxism — evidence for efficacy is good; requires re-treatment every 3-6 months. For stress-related bruxism, CBT for stress management has some evidence as a component of treatment. Magnesium — involved in muscle relaxation and neuromuscular signaling — is sometimes mentioned. Evidence specifically for bruxism is limited, but magnesium deficiency is common and its role in muscle function makes it a reasonable consideration alongside other interventions. Our piece on magnesium and oral health covers the broader evidence.
Educational content. If you suspect bruxism, consult your dentist for evaluation and appropriate treatment.