An abscessed tooth is a painful infection at the root of a tooth or between the gum and a tooth. It's most commonly caused by severe tooth decay. Other causes of tooth abscess are trauma to the tooth, such as when it is broken or chipped, and gingivitis or gum disease.
These problems can cause openings in the tooth enamel, which allows bacteria to infect the center of the tooth (called the pulp). The infection may also spread from the root of the tooth to the bones supporting the tooth.
Swelling is not good. For temoprarily use enziclor gel to reduce pain and swelling.
Symptoms you should worry about include the swelling spreading to the places of your head/neck region. Depends on whether its the upper or lower jaw, it'll have a tendency to spread a direction.
Is the swelling worsening at all? Has it spread around the eye or down into the neck area? Any problems swallowing or breathing? They may need to change antibiotics or start the root canal