A tooth abscess is a painful condition that occurs when a pocket of pus forms in the tissues around a tooth, usually due to a bacterial infection. This infection can result from untreated tooth decay, gum disease, or a cracked tooth. Symptoms often include severe toothache, swelling, and sensitivity to hot or cold. If left untreated, a tooth abscess can lead to serious complications, including the spread of infection to other parts of the body. Treatment typically involves draining the abscess and addressing the underlying cause, which may include a root canal or tooth extraction.