Magnesium is essential for normal muscle and nerve function, so it is easy to see why people wonder whether taking more of it could calm an overactive jaw. But the leap from “magnesium helps muscles function normally” to “magnesium stops teeth grinding” is much larger than it sounds.
At this point, there is not strong clinical evidence showing that magnesium supplements reliably prevent or treat bruxism. Magnesium may still matter for someone who is genuinely deficient or has inadequate intake, but that is a different question from using magnesium as a proven teeth-grinding treatment.
Magnesium has not been proven to stop teeth grinding. It plays an important role in normal nerve and muscle function, and researchers have proposed possible connections between magnesium status, stress regulation and muscle activity. However, direct clinical evidence supporting magnesium supplementation as a treatment for bruxism remains very limited.
If you are trying to understand why you may be grinding or clenching in the first place, start with our guide to the causes and risk factors associated with bruxism.
Why Is Magnesium Linked to Teeth Grinding?
Magnesium is a mineral the body needs for hundreds of normal biochemical processes. Among its better-established roles are helping regulate nerve signaling and muscle function.
That creates a plausible theory: if magnesium status affects neuromuscular function, perhaps inadequate magnesium could influence jaw-muscle activity in some people.
Researchers have also explored how magnesium may interact with stress-response pathways and nervous-system excitability. A recent review discussed several biological mechanisms through which nutritional insufficiencies, including magnesium inadequacy, might theoretically influence bruxism-related muscle activity.
Biological plausibility is not the same as proof of treatment. A mechanism can make scientific sense without demonstrating that taking a supplement actually reduces grinding episodes in people.
What Does the Research Actually Show?
The direct research on magnesium supplementation specifically for bruxism is remarkably thin.
Magnesium and bruxism have been discussed in the dental literature for decades, including early case reports and theoretical discussions. More recent reviews continue to explore possible nutritional relationships, but high-quality randomized clinical trials showing that magnesium supplementation reliably reduces sleep or awake bruxism are lacking.
That distinction matters because bruxism itself is complex. Current evidence recognizes psychological factors, genetics, medications, caffeine, alcohol, smoking and other influences as possible contributors. It is not generally treated as a simple mineral-deficiency disorder.
Large evidence-based reviews of bruxism treatment also do not establish magnesium supplementation as a standard therapy.
Does Magnesium Deficiency Cause Bruxism?
There is no good evidence that magnesium deficiency is a routine or primary cause of teeth grinding.
Severe magnesium deficiency can affect the nervous and muscular systems, but clinically significant deficiency is different from simply eating less magnesium than recommended.
This is an important distinction because claims such as “most Americans are magnesium deficient” can be misleading.
U.S. dietary surveys show that many people consume less magnesium from food than recommended. That does not mean all of those people have clinical magnesium deficiency. The National Institutes of Health notes that symptomatic deficiency caused solely by low dietary intake is uncommon in otherwise healthy people because the kidneys help conserve magnesium.
Certain groups are more likely to develop magnesium inadequacy or deficiency, including people with some gastrointestinal diseases, type 2 diabetes, alcohol dependence and older adults.
Would Magnesium Help If You Are Actually Deficient?
Correcting a true nutrient deficiency is important for general health. If someone has inadequate magnesium status, restoring an appropriate intake may help normalize the biological functions that depend on magnesium.
What we cannot say is that correcting magnesium deficiency will necessarily stop bruxism.
A person could be low in magnesium and grind their teeth for unrelated reasons. Conversely, someone with perfectly adequate magnesium status could still have significant sleep or awake bruxism.
If a deficiency is suspected because of medical history, diet, gastrointestinal disease, medication use or other symptoms, that question is better evaluated with a healthcare professional than inferred from teeth grinding alone.
Which Type of Magnesium Is Best for Teeth Grinding?
No form of magnesium — including magnesium glycinate, citrate, oxide or chloride — has been proven to be the best treatment for bruxism.
Different magnesium compounds do vary in absorption and gastrointestinal tolerability. For example, some more soluble forms are generally absorbed more completely than magnesium oxide.
But better absorption does not automatically make a supplement better for teeth grinding.
Claims that magnesium glycinate is specifically “best for bruxism,” “best for jaw tension” or uniquely calming should be treated cautiously unless supported by clinical evidence specific to those outcomes.
How Much Magnesium Do Adults Need?
There is no established magnesium dose for treating or preventing bruxism.
General recommended dietary amounts are based on nutritional needs, not teeth grinding.
| Group | Recommended magnesium intake |
|---|---|
| Adult men | 400–420 mg per day from all sources |
| Adult women | 310–320 mg per day from all sources |
| Pregnancy | Needs vary by age; generally higher than for nonpregnant women |
Those numbers include magnesium from food, beverages and supplements combined.
The adult upper limit for magnesium from dietary supplements and medications is 350 mg per day unless a healthcare professional recommends otherwise. That upper limit does not include magnesium naturally present in food.
This is another reason not to interpret the nutritional recommendation of 400–420 mg as permission to take that amount in supplement form.
Can You Get Enough Magnesium From Food?
Many people can obtain meaningful amounts of magnesium through ordinary foods.
Good dietary sources include:
- Leafy green vegetables such as spinach
- Beans and other legumes
- Nuts and seeds
- Whole grains
- Fortified cereals
- Milk, yogurt and some other dairy foods
Eating magnesium-rich foods can support overall nutritional adequacy without turning a healthy mineral into a self-prescribed bruxism treatment.
Can Magnesium Improve Sleep and Therefore Reduce Grinding?
This is another appealing theory, but it should not be overstated.
Sleep bruxism occurs within the physiology of sleep, and some people with bruxism also have disrupted sleep or sleep-related conditions. That does not mean that improving sleep with a supplement will necessarily reduce grinding.
Even if magnesium improves a person's sleep for another reason, that does not establish that it treats sleep bruxism itself.
Loud snoring, witnessed breathing pauses, gasping or significant daytime sleepiness deserve separate medical evaluation rather than treatment with magnesium or a standard night guard alone.
Does Magnesium Help Stress-Related Clenching?
Magnesium has been studied in relation to stress and anxiety, including in people with low magnesium status. But evidence that magnesium improves stress does not automatically translate into evidence that it stops bruxism.
Stress and emotional tension can be associated with awake clenching in some people, so addressing stress may still be useful when it is clearly part of the pattern.
For a more direct look at that relationship, see Can Stress Cause Teeth Grinding?.
What About Magnesium and Vitamin B6?
Magnesium and vitamin B6 are sometimes sold or discussed together for stress, nervous-system function and other wellness goals.
There is not convincing evidence that combining vitamin B6 with magnesium stops teeth grinding.
Claims that B-complex vitamins can “cure,” “control” or eliminate bruxism should therefore be treated cautiously unless a specific deficiency has been identified and appropriately managed.
Can Taking Too Much Magnesium Be Harmful?
Yes. Magnesium from food is generally not a concern in healthy people because the kidneys regulate excess amounts.
Supplements are different.
Too much supplemental magnesium can cause diarrhea, nausea and abdominal cramping. Extremely high amounts can produce much more serious effects.
People with impaired kidney function are at greater risk of magnesium toxicity because the kidneys may not remove excess magnesium normally.
Magnesium can also interfere with certain medicines, including some antibiotics and bisphosphonates, and some medications can affect magnesium status.
If you take prescription medications, have kidney disease or another significant medical condition, or are considering magnesium specifically to treat a health symptom, discuss supplementation with a physician or pharmacist.
So What Should You Do If You Grind Your Teeth?
Rather than assuming that grinding means you need more magnesium, look at the broader pattern.
Possible contributors to bruxism can include stress, medications, caffeine, alcohol, smoking, genetics and other individual factors. Awake and sleep bruxism can also behave differently.
If you are not sure whether grinding or clenching is actually occurring, start with our guide to the warning signs of bruxism.
If symptoms began after starting or changing a prescription medication, discuss that timing with the prescribing clinician rather than changing the medication independently.
And if the grinding is causing visible tooth wear, fractures or damage to dental work, protecting the teeth matters regardless of whether the underlying trigger has been identified.
Where a Night Guard Fits In
A night guard does not correct a magnesium deficiency, and it does not guarantee that bruxism will stop.
Its role is mechanical: placing a protective material between opposing teeth so repeated grinding and clenching are less likely to occur directly against natural enamel or dental restorations.
If you want to understand that distinction in more detail, read The Science of Protecting Teeth: How Mouth Guards Help With Grinding & Clenching.
Grinding already causing visible wear?
A dentist can help evaluate whether the damage is active, look for other causes of tooth wear and determine whether a protective appliance is appropriate.
Frequently Asked Questions
Can magnesium stop teeth grinding?
There is not strong clinical evidence that magnesium supplements reliably stop sleep or awake bruxism.
Is teeth grinding a sign of magnesium deficiency?
Not by itself. Bruxism has multiple possible contributors and is not considered a reliable sign of magnesium deficiency.
What magnesium is best for teeth grinding?
No specific form of magnesium has been proven superior for treating bruxism.
Does magnesium glycinate help jaw clenching?
Magnesium glycinate is commonly marketed for relaxation, but there is not strong clinical evidence showing that it specifically reduces jaw clenching or bruxism.
How long does magnesium take to stop teeth grinding?
There is no evidence-based timeframe because magnesium has not been established as a reliable treatment for bruxism.
Can vitamin B6 and magnesium stop bruxism?
There is not convincing clinical evidence that this combination reliably stops teeth grinding.
Should I take magnesium if I grind my teeth?
Teeth grinding alone is not a reason to assume that you need a magnesium supplement. If you are concerned about your intake or possible deficiency, discuss your diet, medical history and medications with a qualified healthcare professional.
Can a night guard stop bruxism?
A night guard is primarily used to protect the teeth from the mechanical effects of grinding and clenching. The underlying jaw activity may continue while the appliance is worn.
The Bottom Line
Magnesium is essential to normal muscle and nerve function, but that does not make magnesium supplementation a proven treatment for teeth grinding.
Current research provides interesting theories about nutrition, nervous-system activity and bruxism, but direct clinical evidence that magnesium supplements stop grinding remains very limited.
If you are genuinely low in magnesium, correcting that deficiency is worthwhile for your overall health. If you grind your teeth, the better approach is to evaluate the full pattern — including stress, medications, sleep, substances and dental findings — while protecting teeth that are already being exposed to damaging forces.
Sources & Further Reading
- National Institutes of Health Office of Dietary Supplements — Magnesium Fact Sheet
- National Institute of Dental and Craniofacial Research — Bruxism
- Nutrient Insufficiencies and Deficiencies Involved in the Pathogenesis of Bruxism — review article
- Bruxism: Best Evidence Consensus Statement
Editor's Note: This article was updated on September 3, 2026 to distinguish biological theories from clinical evidence, clarify that magnesium supplementation has not been proven to treat bruxism, correct outdated claims about magnesium deficiency and supplement forms, and add current safety guidance on magnesium intake and medication interactions.
Medical disclaimer: This article is for educational purposes only and is not a substitute for individualized medical, nutritional or dental advice. Speak with a qualified healthcare professional before using a dietary supplement to treat a health condition.