If you feel a bump in your mouth around your teeth, you may have a mandibular torus—a growth of excess bone around your jaw. Tori can be caused by:
Genetic factors
Teeth grinding (known as bruxism)
Stress on the jaw
Often, tori are harmless, but they can cause irritation and make some dental procedures difficult. For example, you may need to have a mandibular torus removed to get fitted for dentures.