A dental abscess is a collection of pus that can form in the teeth or gums as a result of a bacterial infection. Bacteria are found in plaque (a byproduct of food, saliva and bacteria in the mouth), which damages the teeth and gums. The bacteria can eventually infect and spread within the soft tissues inside a tooth or gums, forming an abscess.
There are two types of dental abscess, periapical abscesses and periodontal abscesses. Dental abscesses can be very painful and tender, and can make a person feel quite unwell.
Without dental treatment, a dental abscess will continue to get worse, and may eventually lead to the destruction of the surrounding bone.