Bony Bumps on the Roof or Floor of Your Mouth: What Tori Are and When They Need Treatment

By Dr. Boris Zusin · Published October 10, 2026

Run your tongue along the inside of your lower jaw or the roof of your mouth and you may find a hard, smooth bump that has always been there. Most of the time it's a torus (plural: tori), a harmless overgrowth of dense bone. They're common, they're slow-growing, and in the large majority of people they never need treatment. Here's what they are, why they form, and the few situations where we do something about them.

What Are Tori?

Tori and exostoses are benign, slow-growing overgrowths of cortical (outer, dense) bone on the jaws. They're considered variants of normal anatomy rather than tumors, and they're typically painless. Treatment isn't needed unless a torus interferes with function, gets in the way of making a denture or other appliance, or is repeatedly injured.

The Three Common Types

Type	Where it is	What to know
Torus palatinus	Midline of the roof of the mouth, along the palatal suture	Can be flat, spindle-shaped, nodular, or lobulated. Reported overall prevalence is roughly 20%, and it is more common in women.
Torus mandibularis	Tongue side of the lower jaw, near the canine and premolar teeth	Usually on both sides (about 80% of cases) and more common in men. Reported prevalence is around 17%, with a range of roughly 12–40% across studies.
Buccal or maxillary exostoses	Cheek side (or palate side) of the upper jaw ridge, sometimes the lower	The least common type, around 6%. Palate-side growths are sometimes classified as torus palatinus.

Across all types, reported prevalence is roughly 10–30% and varies with ethnicity, age (tori tend to become more common as people get older), and sex.

Why Do Tori Form?

The cause isn't fully understood and is almost certainly a mix of factors:

• Genetics. An inherited (autosomal dominant) contribution is the most widely accepted mechanism, but it appears to explain only about 30% of cases. The rest is attributed to environmental and functional factors.
• Chewing and clenching forces. Higher bite forces, bruxism (grinding and clenching), and tooth wear have been linked to tori. One way to think about it is that bone adapts to the load it carries, so a jaw under heavy, repeated stress may thicken in places. People with square jaws and sharp jaw angles, which concentrate stress, show higher rates of mandibular tori.
• Shared pathway. Palatal and mandibular tori occur together more often than chance would predict, which suggests a common underlying cause.

The link with grinding is an association, not proof that grinding causes a torus. Still, if you have tori and wake with jaw soreness or worn teeth, it's a good reason to ask about a custom night guard.

Is It Dangerous?

No. Under the microscope, tori are made of dense, layered cortical bone, sometimes with some spongy bone inside, covered by thin mucosa. Unlike an osteoma (a true benign bone tumor), a torus has limited growth potential, and malignant change has not been reported.

Tori also don't appear to contribute to gum disease. A 2026 cross-sectional study found no link between having a torus and periodontitis.

When a Bony Lump Deserves a Closer Look

Most lumps on the palate or lower jaw in the typical locations are tori, and a dentist can usually tell by looking and feeling. Imaging is rarely needed. We'd look further if a growth:

• appears suddenly, grows quickly, or is in an atypical location;
• is painful, or the surface looks ulcerated or changes color; or
• comes with multiple bony growths in the jaws. Multiple osteomas can occasionally be associated with a genetic condition (Gardner syndrome, a form of familial adenomatous polyposis), which calls for further medical evaluation.

Rarely, a biopsy is used to distinguish a torus from an osteoma or another bony lesion. See also Mouth Sores and Oral Lesions for how we assess other types of mouth changes.

When Do Tori Need to Be Removed?

Asymptomatic tori are left alone. Removal is considered when a torus:

• makes it difficult or impossible to build a well-fitting denture or other prosthesis;
• keeps getting injured. The covering mucosa is thin and slow to heal, so hard foods can cause repeated ulcers;
• interferes with speech or chewing, or traps food and makes cleaning difficult; or
• is planned as a source of the patient's own bone for a graft in implant surgery.

Surgery involves lifting the gum, reducing the bone with a bur, chisel, ultrasonic device, or laser, and stitching the area closed. It's usually done by an oral surgeon, and we coordinate with one when it's needed. Risks include bleeding, infection, fracture, and injury to nearby nerves, salivary ducts, or teeth, and removing a large palatal torus often requires general anesthesia, so we weigh the benefit carefully. Tori rarely grow back, although recurrence has been reported years later.

Tori and Your Dental Care

Even when a torus doesn't need surgery, it's worth telling your dentist about before certain treatments. A lower torus can make impressions, scans, and the fit of a lower denture or oral appliance more complicated, and a large palatal torus can affect an upper denture. We take them into account when planning, and we can often design around them.

If you've noticed a bump you're unsure about, book an exam. It takes a minute to check, and you'll know for certain whether it's just a torus.

This article is for general education and isn't a substitute for an examination. Prevalence figures are drawn from published reviews and vary by population.