Teeth grinding, known clinically as bruxism, is most often driven by stress, but it can also stem from sleep problems, medications, acid reflux, and lifestyle habits like heavy caffeine or alcohol use. About one in four adults clench or grind during the day, and many more do it in their sleep without realizing it. The reason you’re grinding likely isn’t a single cause but a combination of factors reinforcing each other.
Stress and Anxiety Are the Most Common Triggers
The link between stress and teeth grinding isn’t just psychological. It’s a measurable chain of events in your body. When you’re stressed, your brain activates a hormonal cascade that ends with the release of cortisol and other stress hormones into your bloodstream. Elevated cortisol shows up in the saliva of people who grind their teeth, and the grinding itself feeds back into the stress response, creating a self-reinforcing loop: stress causes grinding, and grinding signals more stress to your brain.
At a deeper level, chronic stress changes how your brain controls movement. Under prolonged pressure, dopamine levels drop in the parts of the brain responsible for inhibiting spontaneous muscle activity. With less of that natural braking system in place, the powerful muscles in your jaw become overactive. Research on chronic stress has shown that nerve cells controlling the jaw become more excitable over time, sending stronger signals to the chewing muscles and driving them to clench and grind even when you’re not eating or talking.
This explains why bruxism often flares during high-pressure periods at work, relationship difficulties, or major life transitions. It also explains why the problem can persist even after the stressful event passes, because the neural patterns take time to reset.
Sleep Apnea and Disrupted Breathing
If you grind mostly at night, a breathing problem during sleep could be the trigger. In people with obstructive sleep apnea, most grinding episodes happen right after the airway partially collapses and oxygen levels dip. The brief drop in oxygen triggers a micro-arousal, a tiny jolt that partially wakes your brain, and your jaw muscles clench as part of the arousal response. Even people without a formal sleep apnea diagnosis show a trend toward minor, transient drops in oxygen just before a grinding episode begins.
This connection matters because treating the breathing problem often reduces or eliminates the grinding. If you wake up with a sore jaw, morning headaches, and daytime fatigue, or if a partner has noticed you snoring or gasping, the grinding may be a downstream symptom of disrupted breathing rather than a standalone problem.
Medications That Cause Grinding
Certain antidepressants, particularly SSRIs, are known to trigger bruxism as a side effect. Fluoxetine, escitalopram, and paroxetine have all been documented in clinical reports. The mechanism likely involves changes in serotonin and dopamine balance in the brain regions that control jaw movement. In some cases, switching medications doesn’t resolve it. One well-documented patient developed grinding on escitalopram, was switched to fluoxetine, and the bruxism persisted.
If your grinding started or worsened shortly after beginning a new medication, that timing is worth bringing up with your prescriber. Other drugs linked to bruxism include some stimulants and recreational substances like MDMA and cocaine.
Acid Reflux Has a Surprisingly Strong Link
Gastroesophageal reflux disease (GERD) is one of the less obvious but strongest risk factors. People with GERD are nearly seven times more likely to grind their teeth than people without it. The association is even more pronounced in women, where the odds jump to about 12 times higher. Experiments on healthy adults have shown that introducing acid into the esophagus directly increases grinding episodes during sleep, along with swallowing and brief arousals.
The connection appears to work both through direct irritation and through overlapping problems. Depression, anxiety, and poor sleep quality partially mediate the relationship between GERD and bruxism, meaning reflux may worsen grinding partly by disrupting your sleep and increasing your stress levels. Notably, a small trial in Japan found that treating the reflux with acid-reducing medication moderately reduced grinding episodes, suggesting the link is more than coincidental. If you experience heartburn, a sour taste in your mouth at night, or a chronic cough alongside your grinding, GERD may be a contributing factor worth addressing.
Caffeine, Alcohol, and Smoking
People who smoke, drink alcohol, or consume large amounts of caffeine (more than six cups of coffee a day) are twice as likely to grind their teeth compared to people who don’t. Caffeine and nicotine are stimulants that increase muscle tension and arousal, especially during sleep. Alcohol disrupts sleep architecture, making the lighter, more fragmented stages of sleep where grinding tends to occur more dominant throughout the night. If you’re grinding and also consuming a lot of any of these substances, cutting back is one of the simpler adjustments to try first.
How to Tell You’re Grinding
Many people grind in their sleep and don’t realize it until damage accumulates. The National Institute of Dental and Craniofacial Research identifies these common signs:
- Dental changes: flattened, chipped, cracked, or loose teeth, or enamel worn down enough to expose deeper layers
- Jaw symptoms: soreness, tightness, or tired-feeling muscles in the jaw, especially in the morning
- Pain: tooth sensitivity, facial pain, or headaches (often concentrated at the temples)
A dentist can often spot the wear patterns on your teeth before you notice symptoms yourself. The flat, shiny patches on the biting surfaces of molars are distinctive and hard to miss during a routine exam.
What Helps
Because grinding has multiple potential causes, the most effective approach targets whatever is driving yours. A custom night guard from a dentist protects your teeth from damage but doesn’t stop the grinding itself. It’s a shield, not a cure. For stress-driven bruxism, cognitive behavioral therapy, relaxation techniques, and addressing the underlying anxiety tend to produce more lasting results.
Botulinum toxin injections into the masseter muscles (the large chewing muscles along the jawline) have become a popular option for people with severe grinding or jaw pain. A typical treatment involves 20 to 30 units per side and lasts four to six months before the muscles gradually regain their full strength. This approach weakens the muscles enough to reduce the force of grinding, which can relieve pain and prevent further dental damage while you work on root causes.
If sleep apnea is involved, treating it with a continuous positive airway pressure device or a mandibular advancement appliance often reduces nighttime grinding significantly. If reflux is a factor, managing it with dietary changes or acid-reducing medication can help. And if an SSRI is the culprit, your prescriber may be able to adjust your regimen or add a medication that counteracts the jaw activity.
Children Grind Their Teeth Too
If you’re noticing this in your child rather than yourself, it’s usually less concerning. Most childhood grinding is caused by teething or teeth that haven’t yet aligned properly. The majority of children outgrow it by age six, as their adult teeth begin to come in and their bite settles. Stress can contribute in children just as it does in adults, but there’s no established link between bruxism and behavioral problems in kids.