Mandibular Tori and Bruxism — Is There a Connection to TMJ?

If you've felt a hard, bony bump on the inside of your lower jaw — usually near the tongue side, roughly where your premolars are — you may have discovered a mandibular torus (plural: tori), also called torus mandibularis. It's a common, generally harmless finding. But research has repeatedly linked these bony growths to bruxism, and in some studies, to TMJ disorder itself. Here's what's actually known.

What Is a Mandibular Torus?

A mandibular torus is a benign, bony growth (exostosis) that develops on the lingual — tongue-facing — surface of the lower jawbone, most often near the premolar teeth. It's typically slow-growing, painless, and often found on both sides of the jaw (bilateral). Many people discover theirs by accident: running their tongue along the inside of their jaw, or having it pointed out during a routine dental exam.

These growths are made of dense, compact bone and are not tumors or a sign of disease on their own. They're also relatively common — reported prevalence varies widely across populations, with some studies finding them in roughly 40 to 57% of certain samples.

Mandibular Tori and Bruxism: What the Research Shows

This is where the research gets genuinely interesting. Several well-designed studies have found a meaningful association between mandibular tori and bruxism (teeth grinding and jaw clenching):

• A study using twin pairs — a design that helps separate genetic from behavioral factors — found mandibular tori in 67.5% of bruxers compared to only 31.3% of non-bruxers, a highly statistically significant difference. The same study found extremely high concordance between identical twins for having tori, pointing to a strong genetic component alongside the bruxism association.
• Separate research found that patients with bruxism were four times more likely to have a mandibular torus than patients without bruxism, and that a higher degree of bruxism correlated with a larger torus size.
• A systematic review concluded that the presence of abnormal tooth wear — one of the clearest physical signs of bruxism — increased the odds of having tori, particularly torus mandibularis specifically (as opposed to torus palatinus, the roof-of-mouth counterpart).

The proposed mechanism makes mechanical sense: repetitive clenching and grinding place chronic stress on the jawbone, and bone tends to respond to sustained mechanical load by adding density and, in some individuals, forming these localized growths — similar to how bone can thicken in other areas subjected to repeated stress.

Mandibular Tori and TMJ Disorder

Beyond the bruxism connection, some research has looked directly at whether mandibular tori relate to TMJ disorder (TMD) itself:

• One comparative study found torus mandibularis was significantly more common in TMD patients than in a control group, while a related growth (torus palatinus) showed no such difference — suggesting the mandibular-specific location may matter.
• A more recent study using a splint device to directly confirm nighttime bruxism found a notably elevated odds ratio between mandibular torus and TMD, though the result didn't reach statistical significance in that particular sample size — a good example of a promising signal that needs more research to confirm.

Taken together, mandibular tori appear to function less as a direct cause of TMJ disorder and more as a possible physical marker — a visible sign that someone has a history of significant clenching or grinding, which is itself a well-established contributor to TMJ symptoms.

What This Means If You Have Mandibular Tori

Finding a mandibular torus isn't a diagnosis of anything on its own, and most people with tori never need any treatment for them at all. That said, if you've noticed one and also experience jaw pain, clicking, headaches, or morning jaw soreness, it may be a useful clue pointing toward undiagnosed bruxism as a contributing factor worth addressing.

A few practical notes:

• Mandibular tori themselves are a dental and oral health matter — a dentist or oral surgeon can evaluate their size, monitor for changes, and determine if removal is ever warranted (typically only if they interfere with a denture, cause ulceration from repeated irritation, or grow significantly).
• Addressing the underlying clenching or grinding pattern is a different matter, and often benefits from a broader approach — including chiropractic evaluation of jaw and cervical muscle tension, which frequently accompanies bruxism.
• A properly fitted night guard, made in coordination with your dentist, remains one of the most well-supported tools for managing nighttime bruxism and protecting both teeth and jaw joints.

Frequently Asked Questions

What causes mandibular tori?
Mandibular tori appear to result from a combination of genetic predisposition and mechanical stress on the jawbone, particularly from bruxism (clenching and grinding). Twin studies show a strong genetic component, while multiple studies also show a significant association with bruxism specifically.

Does having a mandibular torus mean I grind my teeth?
Not necessarily, but it's a meaningful possibility worth considering. Several studies have found bruxers are two to four times more likely to have mandibular tori than non-bruxers, though genetics and other factors also contribute, and not everyone with tori has bruxism.

Are mandibular tori linked to TMJ pain?
Some research has found mandibular tori more common in patients with TMJ disorder than in those without it, though findings aren't fully consistent across all studies. The likely explanation is that both tori and TMJ symptoms can share a common contributing factor — chronic clenching or grinding — rather than tori directly causing TMJ pain.

Do mandibular tori need to be removed?
Usually not. Most mandibular tori are harmless and require no treatment. Removal is typically only considered if they interfere with a denture or oral appliance, cause repeated ulceration or irritation, or grow substantially. This is a decision for a dentist or oral surgeon.

Can chiropractic care help if I have mandibular tori and jaw pain?
Chiropractic care doesn't address the bony growth itself — that's a dental and oral health matter — but it can help evaluate and address jaw and cervical muscle tension often associated with the clenching and grinding patterns linked to tori formation, which may be contributing to jaw symptoms.