You can’t consciously stop yourself from clenching during sleep, but you can reduce how often it happens and protect your teeth from damage. The most effective approach combines a hard night guard to shield your teeth with lifestyle changes that target the triggers, like stress, caffeine, alcohol, and certain medications. Most people see improvement within a few weeks of consistent changes.
Why You Clench at Night
Sleep bruxism isn’t a single problem with a single cause. It sits at the intersection of your nervous system, stress levels, sleep quality, and sometimes your airway. The main risk factors include psychological stress, anxiety, alcohol, caffeine, smoking, genetics, and certain medications. Your brain cycles through lighter and deeper sleep stages throughout the night, and clenching episodes tend to cluster during transitions between those stages, when your jaw muscles briefly activate.
One connection that surprises many people: sleep apnea and bruxism frequently overlap. In one study using overnight sleep recordings, bruxism occurred in about 54% of patients with obstructive sleep apnea, compared to only 27% of those without it. Researchers believe the jaw may clench as a reflex to push the lower jaw forward and reopen a collapsing airway. If you snore heavily, wake up gasping, or feel exhausted despite a full night’s sleep, untreated sleep apnea could be driving your clenching. This matters because a standard night guard can actually worsen sleep apnea by pushing the jaw backward. Patients with both conditions need a mandibular advancement device instead, which holds the jaw forward to keep the airway open.
Check Your Medications
If you take an antidepressant and noticed clenching started or worsened around the same time, the medication may be the cause. A systematic review of published case reports found that bruxism prevalence was 24.3% among antidepressant users versus 15.3% in people not taking them. The most commonly reported culprits were fluoxetine (Prozac), venlafaxine (Effexor), sertraline (Zoloft), paroxetine (Paxil), and duloxetine (Cymbalta). Some ADHD medications and seizure drugs also carry this risk.
If you suspect your medication is involved, don’t stop it on your own. The most common solution reported in the literature is adding a low-dose anti-anxiety medication called buspirone (5 to 10 mg, up to three times daily), which resolved symptoms in the majority of reported cases. Dose reduction or switching medications are other options your prescriber can evaluate.
Night Guards: Hard Beats Soft
A night guard won’t stop the clenching itself, but it prevents your teeth from grinding against each other and reduces the force your jaw muscles generate. Current guidelines are clear on this: hard acrylic guards are preferred over soft, rubbery ones. Multiple studies have found that soft guards can actually increase jaw muscle activity in some people, essentially giving your muscles something satisfying to chew on. In one early study, a rigid guard reduced muscle activity in 80% of participants, while a soft guard increased it in half of them.
Custom-fitted guards from a dentist provide the best fit and durability. Over-the-counter boil-and-bite versions can work as a short-term option, but they tend to be bulkier, less comfortable, and wear out faster. Patients consistently report less morning jaw pain and stiffness with a well-fitted hard guard, even though monitoring shows they still clench at roughly the same frequency. The guard absorbs the force instead of your teeth.
If you already have significant tooth wear (visible flat, shiny spots on your molars, chipped edges on front teeth, or V-shaped notches near the gumline of your premolars and canines), getting a guard sooner rather than later protects against further damage.
Daytime Habits That Help at Night
What you do during the day directly affects what your jaw does while you sleep. The first-line recommendation from clinical guidelines is straightforward: avoid alcohol, caffeine, and tobacco before bed. All three increase nervous system arousal and have been independently linked to more frequent clenching episodes.
Throughout the day, practice what physical therapists call the “N position.” Place the tip of your tongue against the roof of your mouth, just behind your front teeth, as if you’re about to say the letter N. Your teeth should be slightly apart and your lips barely touching. This is the natural resting position for your jaw, and training yourself to return to it breaks the habit of daytime clenching that carries over into sleep.
You can also do a targeted jaw stretch: hold that tongue-on-the-roof position and slowly open your mouth about two inches in a straight line without letting your tongue drop. Hold for six seconds, close gently without letting your teeth touch, and repeat six times. Doing this roughly every two hours throughout the day helps retrain the muscles and release accumulated tension. It takes less than a minute each time.
Stress and Relaxation Approaches
Stress is the most commonly cited trigger, and it’s the one most people intuitively recognize. You clench more during stressful periods. The formal evidence for cognitive behavioral therapy specifically reducing sleep bruxism is still limited, with researchers noting that study sizes have been too small to draw firm conclusions. However, one small controlled trial found that a CBT program reduced measurable jaw muscle activity more than a night guard alone over six months. Hypnotherapy also showed promise in a small study where every participant had lower clenching activity after treatment.
Biofeedback has stronger evidence behind it. Devices that detect jaw muscle activation during sleep and deliver a mild stimulus (usually a small vibration or electrical signal) reduced clenching-related muscle activity by 35 to 55% in clinical trials. The catch: when the biofeedback stopped, clenching gradually returned to baseline levels within a few weeks. This suggests biofeedback works well as a training tool but may need periodic use to maintain results.
General relaxation techniques, progressive muscle relaxation, and good sleep hygiene (consistent bedtime, cool room, limited screen time) are all recommended as a starting point in clinical guidelines, even if individual studies on them haven’t shown dramatic overnight results. They lower baseline stress, which lowers the neural drive behind clenching.
Botox for Severe Cases
When a night guard and lifestyle changes aren’t enough, injections of botulinum toxin into the jaw muscles can directly reduce clenching force. The treatment targets the masseter muscles on each side of your jaw and sometimes the temporalis muscles near your temples. It reduces biting force by roughly 20 to 40%, with the effect kicking in around the third week and lasting three to six months before repeat injections are needed.
Because the muscles are partially relaxed, they gradually shrink during the treatment window, which can also slim the lower face in people with enlarged jaw muscles from years of clenching. This isn’t a first-line treatment, and it requires repeat visits, but it offers real relief for people with significant pain, headaches, or tooth damage that other approaches haven’t controlled.
The Role of Magnesium
Magnesium plays a central role in muscle relaxation and nerve signaling, and deficiency symptoms overlap heavily with bruxism triggers: muscle tightness, anxiety, insomnia, and increased neuromuscular excitability. Low magnesium levels have been linked to heightened activity in the trigeminal nerve, which controls your jaw muscles. Research suggests that appropriate supplementation of magnesium, sometimes combined with vitamin B6, can reduce neurological and musculoskeletal symptoms including anxiety, muscle spasms, and pain.
No large clinical trial has directly tested magnesium as a standalone bruxism treatment, so it’s not a guaranteed fix. But given that many adults don’t get enough magnesium from their diet, correcting a potential shortfall is low-risk and may take the edge off nighttime muscle tension. Leafy greens, nuts, seeds, and legumes are the richest food sources.
Signs Your Teeth Are Already Affected
Bruxism doesn’t always announce itself with obvious symptoms. You might notice it only through the damage it leaves behind. Clinicians look for a specific set of signs: flat, shiny wear facets on your molars where enamel has been ground away, matching wear patterns on upper and lower teeth that meet during clenching, cracked enamel, broken fillings or crowns, and V-shaped wedge lesions (called abfractions) near the gumline of your premolars and canines. Ridges or scalloped impressions along the edges of your tongue and the inside of your cheeks are also telltale signs.
Morning symptoms are the most direct clue: a sore, fatigued jaw when you wake up, dull headaches focused at the temples, or teeth that feel sensitive for no obvious reason. The formal diagnostic criteria require grinding or clenching during sleep plus at least one of these: abnormal tooth wear, morning jaw pain or fatigue, or temporal headaches. If that sounds familiar, a dental exam can confirm whether damage is already underway and help you choose the right combination of protection and treatment.