An abscess in the mouth is a pocket of pus caused by a bacterial infection. It can form inside the teeth, in the gums, or in the bone that holds the teeth in place. An abscess at the end of a tooth is called a periapical abscess, while an abscess in the gum is called a periodontal abscess. Dental abscesses are often painful, but not always. Signs of a dental abscess include intense toothache or pain in the gums, redness inside the mouth or outside the mouth on the face or jaw, sensitivity to hot or cold food and drink in the affected area, a bad taste in your mouth, difficulty opening your mouth and chewing food, a swollen face or jaw, and a high temperature. If you think you have a dental abscess, you should see a dentist as soon as possible. Dental abscesses are treated by removing the source of the infection and draining away the pus. Depending on the location of the abscess and how severe the infection is, possible treatments include root canal treatment, antibiotics, or surgery to drain the abscess. It is important to note that a dental abscess will not go away on its own and requires treatment from a dental healthcare provider.