You can’t consciously stop clenching your teeth during sleep, but you can reduce how often it happens and protect your teeth from damage. The most effective approach combines a dental guard with changes to your stress levels, sleep habits, and sometimes medical treatment. Most people see improvement within a few weeks of starting.
Why You Clench in Your Sleep
Sleep bruxism isn’t a simple habit you can will yourself out of. It’s driven by your nervous system. In the minutes before a clenching episode, your brain’s activity increases, your heart rate rises, and the muscles around your jaw activate, all while you remain asleep. These episodes are tied to brief disruptions in sleep called microarousals, moments when your brain partially wakes without you realizing it.
One theory suggests that clenching actually serves a protective function. When your heart rate spikes during sleep, the jaw muscles contract and stimulate a nerve that slows the heart back down. In this view, your body uses clenching as a kind of reset button for your cardiovascular system during sleep. That’s part of why it’s so persistent: your nervous system treats it as useful.
Stress is the most commonly cited trigger. Anxiety and psychological tension increase the activity of your sympathetic nervous system (your fight-or-flight response), which makes those microarousals more frequent and intense. But stress isn’t the only driver. Breathing problems during sleep, certain medications (especially some antidepressants), alcohol, and caffeine can all increase clenching.
The Sleep Apnea Connection
If you clench your teeth at night, it’s worth considering whether you also have a breathing problem during sleep. There’s a well-documented link between obstructive sleep apnea and bruxism. When the airway becomes partially blocked, the jaw muscles may activate to help reopen it. Clenching and grinding also appear to lubricate the tissue in the back of the throat, which dries out from labored breathing.
This matters because treating the airway problem often reduces or eliminates the clenching. If you snore heavily, wake up with a dry mouth, or feel unrested despite a full night’s sleep, a sleep study can determine whether apnea is contributing to your bruxism. Addressing only the clenching while ignoring a breathing disorder leaves the root cause untreated.
Mouthguards and Splints
A dental guard won’t stop you from clenching, but it prevents your teeth from grinding against each other and absorbs the force your jaw generates. This is the first line of defense for most people, and it’s worth getting right.
You have two main options: store-bought guards and custom-made ones from a dentist. Store-bought guards are cheaper (usually $15 to $40), but they don’t fit as precisely and wear out faster. Custom guards, which a dentist molds to your exact dental anatomy, are more comfortable, more durable, and more effective at distributing bite force evenly. They typically cost $300 to $800 but last significantly longer. If you’re a heavy clencher, the custom route pays for itself by preventing dental damage that costs far more to repair.
If you go the store-bought route first, look for a “boil and bite” guard rather than a one-size-fits-all option. It won’t match a custom fit, but it’s a reasonable starting point while you figure out the severity of your problem.
How to Tell If You’re Clenching
Since it happens while you sleep, many people don’t realize they clench until damage has already started. Common signs include waking up with a sore or tight jaw, dull headaches (especially around the temples), facial pain, and teeth that look flattened or chipped. A dentist can spot worn enamel, cracked teeth, or damage to the inner layers of a tooth during a routine exam. In some cases, a sleep study with audio and video recording is used to confirm the diagnosis and measure severity.
Left untreated over years, chronic clenching can lead to temporomandibular joint disorders, which cause lasting pain, difficulty chewing, and clicking or locking of the jaw.
Stress and Relaxation Techniques
Because the nervous system’s stress response is one of the strongest drivers of sleep bruxism, anything that lowers your baseline stress level can reduce clenching frequency. This isn’t a vague suggestion to “relax more.” Specific practices have practical effects on the jaw muscles.
Progressive muscle relaxation before bed is particularly relevant. You systematically tense and release muscle groups, finishing with the jaw and face. This trains the muscles to let go of tension rather than carrying it into sleep. Placing your tongue gently between your front teeth for a few minutes before sleep can also help, since the jaw muscles can’t fully clench in that position, and it encourages relaxation of the masseter (the primary chewing muscle on each side of your face).
Reducing caffeine and alcohol, especially in the afternoon and evening, also helps. Both substances increase microarousals during sleep, which are the trigger events for clenching episodes.
Sleep Position and Hygiene
Sleeping on your stomach pushes your jaw out of alignment and puts extra pressure on the joint. Sleeping on your back or side keeps your head in line with your spine and reduces mechanical stress on the jaw. If you’re a stomach sleeper, switching positions is one of the simplest changes you can make.
General sleep quality matters too. Anything that fragments your sleep, including irregular schedules, screen use before bed, a warm room, or untreated insomnia, increases the number of microarousals per night. Fewer microarousals means fewer opportunities for clenching episodes to begin.
Biofeedback Devices
A newer category of treatment uses biofeedback technology built into a custom oral appliance. Sensors in the device detect when clenching begins and deliver a subtle signal (not enough to wake you) that prompts your jaw muscles to relax. In a clinical study of 26 patients with confirmed sleep bruxism, one such device reduced total clenching duration by about 60% per hour of sleep. The effect was consistent regardless of how severe the bruxism was at baseline.
These devices are still relatively new and not widely available, but they represent a shift from passively protecting teeth to actively reducing the clenching itself.
Botox for Severe Clenching
For people whose clenching causes significant pain or hasn’t responded to other treatments, injections into the masseter muscles can weaken them enough to reduce the force of clenching. A typical treatment uses 20 to 30 units per side, and the effect lasts four to six months before the muscles gradually regain full strength. It doesn’t eliminate the neural signal to clench, but it reduces the damage and pain that clenching causes. Repeat treatments are needed to maintain the effect.
Medications
Prescription medications are generally reserved for severe cases or short-term use, since most carry side effects or addiction risk. Muscle relaxants and anti-anxiety medications can temporarily reduce jaw muscle activity during sleep, but long-term use raises concerns about dependence. Some blood pressure medications have shown benefit by dialing down the sympathetic nervous system activity that precedes clenching episodes, essentially calming the fight-or-flight response during sleep.
If your bruxism started or worsened after beginning an antidepressant, that connection is worth discussing with your prescriber. Certain antidepressants are known to increase clenching, and adjusting the medication or adding a counteracting drug can help.
What About Magnesium?
Magnesium supplements are widely recommended online for bruxism, but the clinical evidence is thin. A study published in the Journal of Clinical Medicine compared mineral intake between people with and without sleep bruxism and found no significant difference in magnesium levels between the two groups. The same was true for calcium, zinc, iron, and every other mineral tested. The one nutrient that did show a potential connection was dietary fiber, though more research is needed to understand why. Taking magnesium for general muscle relaxation or sleep quality is unlikely to hurt, but it shouldn’t be your primary strategy for stopping clenching.