Bump in mouth behind bottom teeth

A bump behind the lower front teeth may be normal anatomy, a blocked salivary duct, irritation, or a dental infection needing examination.

The inner gum can contain firm bony prominences, including a normal lingual mandibular ridge, while the floor of the mouth contains salivary ducts and glands. A new, tender, ulcerated, growing, or one-sided lump has a different clinical significance from a long-standing smooth bump.

Do not squeeze, cut, or repeatedly press the area. Check it gently in good light, avoid sharp foods, keep brushing and cleaning between teeth, and note its size, colour, tenderness, and duration.

Arrange a dental examination for a persistent or changing lump, bleeding, numbness, an ulcer that does not heal, or tooth pain beside it. Urgent care is needed for rapidly spreading swelling, fever, or difficulty breathing or swallowing.

Ask whether the shape is normal bone or soft tissue, whether a tooth or salivary duct is involved, and whether an examination, dental X-ray, or referral is needed.