What causes a dental abscess?

A dental abscess is caused by a bacterial infection that typically originates from untreated tooth decay, a cracked tooth, or gum disease. When bacteria enter the tooth through a cavity, crack, or gum pocket, they can infect the pulp (the innermost part of the tooth) or the surrounding tissues. The body’s immune response to the infection results in the accumulation of pus, forming an abscess. Poor oral hygiene, a diet high in sugar, and certain medical conditions can increase the risk of developing a dental abscess.