Using your tongue, feel the inside of your lower jaw in the area where the roots of your lower teeth are located. Now feel the middle roof of your mouth. Do you feel any hard bumps? There is no need to worry. These bumps are most likely harmless growths of extra bone called tori.
According to the Journal of Clinical and Diagnostic Research, tori (or torus if it is a single bump) are harmless growths of bone within the mouth. They are simply defined as hills of bone covered by normal gum tissue and are considered to be ordinary and completely healthy. They can present on one side of the mouth, but are most likely to be found bilaterally. Three places patients are most likely to have them are: mandibular lingual tori according to Dentistry Today, which are located on the tongue side of the lower jaw; maxillary tori, which are found on the roof of the mouth and are also called tori palatini; and the cheek side of upper molars, also known as buccal exostoses.