Bruxism is the involuntary grinding, clenching, or gnashing of teeth. Most people who do it are completely unaware — it typically happens during sleep, when there's no conscious control. By the time someone discovers they're a grinder, the damage to their teeth has often already begun.
This guide explains what causes bruxism, what it does to your teeth and jaw over time, how it's diagnosed, and what treatments actually work.
How common is it? Bruxism affects an estimated 8 to 31% of the general population. Sleep bruxism is more common than daytime clenching, and many people have both. It affects adults and children alike.
What causes bruxism
Bruxism has multiple contributing factors and is rarely caused by just one thing. The most well-established causes and triggers are:
- Stress and anxiety — the most common driver. Emotional tension is often expressed physically through jaw clenching and grinding during sleep
- Sleep disorders — sleep bruxism is closely associated with sleep apnea and snoring. People with obstructive sleep apnea grind their teeth at significantly higher rates
- Certain medications — SSRIs and other antidepressants are associated with increased bruxism as a side effect
- Stimulants — caffeine, alcohol, and recreational drugs (particularly MDMA) increase bruxism frequency and intensity
- Bite problems — misaligned teeth or an uneven bite can contribute to grinding, though this is less clearly established than stress
- Genetics — bruxism runs in families and has a hereditary component
What bruxism does to your teeth and body
The forces generated during grinding can be 6 to 10 times greater than normal chewing forces. Over months and years, this causes progressive, irreversible damage:
Enamel Wear
The biting surfaces of teeth flatten and shorten. Teeth lose their natural shape and translucency. Enamel, once lost, doesn't grow back.
Cracked Teeth
Repeated lateral grinding forces create cracks in teeth that can propagate to the pulp, requiring root canals or extraction.
Broken Restorations
Fillings, crowns, veneers, and bridges fracture under grinding forces at much higher rates than in non-grinders.
TMJ Disorder
The jaw joint becomes overloaded, causing pain, clicking, limited mouth opening, and facial muscle soreness.
Headaches
Morning headaches — particularly at the temples — are a hallmark sign of nighttime grinding from the constant muscle tension.
Tooth Sensitivity
Enamel loss exposes dentin, making teeth increasingly sensitive to temperature and pressure.
How to know if you grind your teeth
Sleep bruxism is often diagnosed by someone else — a partner who hears it — or by a dentist who spots the wear patterns. Signs to look for:
- Waking up with jaw soreness, facial pain, or headaches concentrated at the temples
- Teeth that look shorter, flatter, or more worn than they used to
- Increased tooth sensitivity without an obvious cause
- Cheek tissue on the inside of your mouth that feels rough or irritated from chewing
- A partner reporting grinding sounds during sleep
- Indentations on the sides of your tongue from clenching
- Your dentist pointing out wear facets on your teeth at a checkup
Treatment options
Night guard — the first and most important step
A custom-fitted night guard is the primary treatment for sleep bruxism. It doesn't stop the grinding behavior — but it absorbs and redirects the forces, protecting enamel and dental work from further damage. A custom guard from your dentist fits precisely and is far more effective than over-the-counter options, which are thicker, less comfortable, and less accurately fitted.
Stress management
Since stress is the most common driver, addressing it directly is one of the most effective long-term strategies. Cognitive behavioral therapy, relaxation techniques, exercise, and improved sleep hygiene all have evidence supporting reduction in bruxism frequency and intensity.
Biofeedback
Biofeedback devices monitor jaw muscle activity and alert the wearer when clenching occurs, gradually training the habit to reduce. More commonly used for daytime clenching than sleep bruxism.
Botox injections
Botulinum toxin injected into the masseter muscles (the large chewing muscles) reduces their force significantly without affecting normal chewing. The effect lasts 3 to 6 months and needs to be repeated. Used for severe cases where a night guard alone isn't sufficient.
Treating associated sleep apnea
For patients whose bruxism is linked to sleep apnea, treating the sleep apnea — with CPAP or an oral appliance — frequently reduces or eliminates the grinding as well.
Daytime clenching
Many grinders also clench during the day without realizing it — particularly during concentration, stress, or physical exertion. The treatment for daytime clenching is awareness. A helpful habit: several times a day, consciously check whether your teeth are in contact. Your teeth should only touch when you're actively chewing or swallowing. If your teeth are resting together, your jaw muscles are contracting — and damage accumulates. Practice resting with your lips together but teeth slightly apart.
The bottom line
Bruxism is a serious, progressive condition that causes irreversible dental damage over time. A night guard protects your teeth. Stress management addresses the root cause. If your dentist has mentioned wear patterns or if you wake up with jaw pain and headaches — take it seriously and get a custom guard made. The cost of a guard is a fraction of the cost of repairing the damage bruxism causes.