Why do I have a hard, painless lump on my jawbone?

A hard bump on your jaw doesn't automatically mean something is wrong. In fact, the most common cause is a torus, a bony growth that forms naturally along the jaw or roof of the mouth and is not cancer. Tori (the plural of torus) tend to grow slowly and often go unnoticed for years. Many do not need treatment. Still, any new lump should be checked because several conditions can look alike. 

What you will learn in this article: 

• A torus is a noncancerous growth of bone. 

• Tori are usually hard, painless and slow-growing. 

• A lasting or changing lump should be checked by a dental provider. 

• A dental exam can often show whether a lump is a torus or needs more testing. 

If you've found a new lump on your jaw, schedule an appointment with an Aspen Dental provider. Your care team can look at the area and tell you what it is. 

What is a bony lump on the jaw usually called? 

A hard bump on the inside of the lower jaw may be a torus mandibularis. It often forms near the premolars and may appear on one or both sides. A similar growth in the middle of the roof of the mouth is called a torus palatinus. 

These growths are made of bone and covered by a thin layer of tissue. A review of research on tori found that they tend to grow slowly and often cause no symptoms. It also notes that their exact cause is still unclear.¹ 

What does a benign bony lump feel like? 

A benign bony growth is usually: 

• Very hard, like the surrounding bone

• Covered by a thin layer of gum tissue

• Painless

• Slow-growing or unchanged for a long time

• Sometimes found on both sides of the jaw

These features may fit a torus, but they do not prove what the lump is. A dental provider should examine the area to confirm the cause. 

When is a jaw lump a bigger concern? 

A torus is noncancerous, but not every jaw lump is a torus. The National Institute of Dental and Craniofacial Research advises seeing a dental or medical provider if a lump, sore or thick area in the mouth lasts more than two weeks. Pain, bleeding, numbness or trouble moving the jaw are also warning signs.² These symptoms do not always mean cancer, but they should not be ignored. 

Get the lump checked promptly if: 

• It grows or changes quickly. 

• The tissue over it becomes sore and does not heal. 

• You develop trouble chewing, swallowing or speaking. 

What other conditions can look like a bony jaw lump? 

Not every lump starts in the bone. A soft lump inside the cheek or lip and a gum lump can look like a bony bump at first. However, they start in different tissues and may have different causes. 

Your dental provider can check where the lump begins, how firm it is and whether it has changed. 

What happens at a dental visit for a jaw lump? 

You do not need to identify the lump on your own. Your dental provider will look at it, gently feel it and ask how long it has been there. They will also ask whether it has changed or caused any other symptoms. 

Tori can often be identified during a clinical exam. If a torus is not causing trouble, it can usually be left alone. Removal may be considered if it gets in the way of a denture, chewing or speech, or if the tissue over it keeps becoming sore.¹ 

If the finding is not clear, your dental provider may recommend imaging, another test or a visit with a specialist. If you are also missing teeth or thinking about your long-term bone health, ask how an implant may fit into your care plan. 

Whatever the cause, having the lump checked can give you clear next steps. 

Do not wait on a jaw lump that worries you. Contact your local dental provider to have it examined. 

Why do I have a hard, painless lump on my jawbone? FAQs 

Still have questions about a jaw lump? These answers cover a few common concerns. 

Can a bony jaw lump go away on its own? 

A torus usually stays in place unless it is removed. It may stop growing and remain about the same size for years. An exam is needed to confirm that the lump is a torus. 

Does a bony jaw lump mean I need surgery? 

No. Most tori are simply monitored over time rather than removed. Your dental provider will check the torus at your regular visits to confirm it hasn't changed, and surgery is really only considered if it starts interfering with daily things like eating, speaking or wearing a denture. 

Can children get bony lumps on the jaw? 

Yes, but lower-jaw tori are uncommon in young children. Any new lump in a child's mouth should be checked by a dental provider. 

Should I worry if the lump has been there for years without changing? 

A lump that has not changed may be less urgent than one that is growing quickly. Still, mention it at your next dental visit so your provider can confirm what it is. Have it checked sooner if it starts to hurt, bleed or cause numbness. 

Can stress or teeth grinding cause a jaw lump? 

The exact cause of tori is not clear. Research has found links between lower-jaw tori and clenching or grinding, but that does not prove these habits caused the growth.¹ Tell your dental provider if you clench or grind so they can also check your teeth and jaw. 

Sources 

¹ Medicina Oral, Patología Oral y Cirugía Bucal: “Current status of the torus palatinus and torus mandibularis.” https://www.medicinaoral.com/medoralfree01/v15i2/medoralv15i2p353.pdf 
² National Institute of Dental and Craniofacial Research: “Oral Cancer.” https://www.nidcr.nih.gov/health-info/oral-cancer