Written by the Nuvirox Research Team
- Sleep bruxism (grinding or clenching during sleep) affects roughly 8% of adults and is strongly linked to stress, anxiety, and heightened nervous-system arousal.
- Occlusal splints protect teeth but a randomized trial found they work about as well as sleep hygiene and relaxation training for reducing stress scores and grinding episodes — not clearly better.
- A placebo-controlled trial of Botox injections found no significant reduction in actual grinding episodes, only in muscle activity — an honest reminder that not every plausible fix holds up in trials.
Short answer: yes, with honest caveats. Stress and heightened nervous-system arousal — the same kind of overactive nighttime arousal discussed in our piece on quieting a racing mind at bedtime — are among the most consistently identified triggers of sleep bruxism, the involuntary grinding or clenching of teeth during sleep. But bruxism is a movement disorder with several contributing pathways — sleep-related arousal, airway issues, certain medications, and genetics all play a role — so "stress relief" alone doesn't fully explain who grinds and who doesn't, and the treatments that intuitively seem like they should work best (protective splints, muscle-relaxing injections) haven't always outperformed simpler behavioral approaches in trials.
What is actually happening when you grind your teeth at night?
Sleep bruxism is classified as a stereotyped, repetitive jaw-muscle activity, and it's common: awake clenching affects roughly 20% of adults, while sleep grinding affects around 8%.1 It typically clusters with brief arousals from sleep — micro-awakenings that also involve upticks in heart rate and muscle tone. That's part of why bruxism is thought of less as a purely "dental" problem and more as a nervous-system arousal event that happens to express itself through the jaw.
Why does stress specifically make it worse?
Stress and anxiety raise baseline sympathetic nervous system activity, which increases the frequency of the brief sleep arousals that bruxism rides along with. Clinical protocols for bruxism routinely screen for pain, mandibular range of motion, sleep quality, anxiety, stress, and depression together, precisely because they cluster.2 That clustering is consistent with stress acting as an amplifier of an underlying arousal-driven mechanism, rather than as a stand-alone cause.
What human studies actually show
Manual physical therapy improved sleep quality alongside jaw symptoms. A randomized controlled trial of 45 patients with diagnosed sleep bruxism compared deep-stripping massage, trigger-point pressure release massage, and a control condition (TENS plus passive stretching) over six weeks, measuring outcomes with the Pittsburgh Sleep Quality Index and jaw mobility.3 Both massage approaches were designed to address the muscular tension component of bruxism directly, reflecting current interest in treating the muscle activity itself rather than only protecting teeth from wear.
Occlusal splints weren't clearly superior to sleep hygiene and relaxation. A randomized trial found that oral splints reduced both stress scores and bruxism episodes — but were not found to be superior to a combined sleep hygiene and progressive muscle relaxation approach.1 In other words, the low-cost behavioral intervention performed comparably to the appliance that dentists commonly prescribe.
Here's the honest counterweight: Botox didn't reduce actual grinding episodes. A randomized, placebo-controlled trial injected botulinum toxin type A into the masseter muscles of sleep bruxism patients and tracked outcomes with full audio-video polysomnography before treatment, at four weeks, and at twelve weeks.4 None of the bruxism episode variables showed a significant difference between the Botox and placebo groups — only a muscle electrical-activity measure (EMG peak amplitude) changed. This is a useful reality check: an intervention that clearly reduces muscle strength doesn't necessarily reduce the underlying grinding events themselves.
What teeth grinding won't fix on its own — and when to see a dentist
None of the current evidence suggests that stress management alone will eliminate bruxism for everyone. Some cases are linked to airway issues like sleep apnea, in which case a stabilization splint can actually make breathing problems worse and needs to be used cautiously.1 If you're waking up with jaw pain, headaches, worn or chipped teeth, or a partner reports loud grinding sounds, it's worth seeing a dentist to rule out airway involvement and get a proper diagnosis before starting any appliance.
What actually seems to help, based on the trials above
Two low-cost approaches have real trial support: a structured sleep hygiene and progressive muscle relaxation routine (as effective as a splint for reducing stress-linked grinding episodes), and, where jaw muscle tension is prominent, manual therapy techniques like deep-stripping or trigger-point massage, which improved both sleep quality scores and jaw mobility over six weeks. Splints remain useful for protecting tooth enamel from wear even when they don't outperform behavioral approaches for reducing the underlying stress-arousal pattern.
FAQ
Can anxiety alone cause teeth grinding, or does something else have to be going on?
Anxiety and stress are consistently associated with bruxism, but they're one contributor among several — airway issues, certain medications, and individual arousal thresholds during sleep also play a role. That's why treatments that only target stress don't work for everyone.
Do mouthguards stop the grinding, or just protect your teeth?
Occlusal splints mainly protect enamel from wear; the trial evidence above suggests they don't clearly reduce the underlying grinding activity more than sleep hygiene and relaxation training do.
Is sleeping position linked to bruxism?
Some limited evidence suggests sleeping at a 30-degree incline (the "Fowler position") may reduce episodes compared to lying flat on your back, though the researchers themselves describe this evidence as preliminary.1
When should I actually see a dentist about this?
If you notice tooth wear, jaw soreness on waking, frequent headaches, or a partner mentions grinding sounds, it's worth a dental evaluation — partly to rule out an airway component before fitting any appliance.
Where winding-down habits and Sleep+ Restore fit in
FROM NUVIROX
Why we formulated Sleep+ Restore
We built Sleep+ Restore around the idea that a calmer nervous-system state at bedtime is worth supporting — not as a fix for bruxism itself, but as part of a broader wind-down routine alongside the sleep hygiene approaches shown above. We're not listing individual ingredients or amounts here since the formula is currently being refined, but every batch is backed by our 60-day money-back guarantee, long enough to actually judge whether it fits into your routine.
Learn more about Sleep+ Restore →The bottom line
Stress genuinely does drive sleep bruxism for a meaningful share of people who grind their teeth, largely by increasing the nighttime arousal episodes that grinding rides along with. But the trial evidence is refreshingly humble about which specific treatments help: sleep hygiene and relaxation training hold their own against dental splints, manual therapy shows promise for the muscular component, and at least one plausible-sounding fix (Botox) didn't move the needle on actual grinding events in a well-controlled trial. If grinding is damaging your teeth or waking you with pain, loop in a dentist for a proper diagnosis before choosing a treatment path.
References
- El-Gendy MH, et al. "Effect of manual physical therapy on sleep quality and jaw mobility in patients with bruxism: A biopsychosocial randomized controlled trial." Front Neurol. 2022. DOI: 10.3389/fneur.2022.1041928.
- Shim YJ, et al. "Botulinum Toxin Therapy for Managing Sleep Bruxism: A Randomized and Placebo-Controlled Trial." Toxins. 2020;12(3):168. DOI: 10.3390/toxins12030168.
- MedLink Neurology. "Sleep-related bruxism." Clinical review summarizing RCT evidence on splints, sleep hygiene, and progressive muscle relaxation. Accessed 2026.
- Effectiveness of two physical therapy interventions relative to dental treatment in individuals with bruxism (study protocol). NCT01778881. BMC Musculoskelet Disord.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This article is for informational purposes only and is not a substitute for professional medical advice.