An abscess is a painful collection of pus that can occur in any part of the body, including the mouth. Dental abscesses are caused by a bacterial infection that enters the pulp of the tooth, the innermost layer of the tooth that contains nerves and blood vessels. If the infection is not treated, it can spread to the surrounding tissues, causing pain, swelling, and fever.
Dentists treat dental abscesses by draining the pus and removing the infected tissue. This can be done through a root canal, which involves drilling into the tooth to remove the infected pulp, or through an incision and drainage procedure, which involves making a small cut in the gum to drain the pus. Antibiotics are also typically prescribed to clear up the infection.