If bacteria enter the root of a tooth, it can lead to an infection called an abscessed tooth, or periapical abscess. This infection causes a buildup of pus and won't go away on its own. It's crucial to see a dentist if you suspect you have an abscessed tooth. Without treatment, the infection can spread to your jaw, head, or neck. To ease symptoms, you can rinse your mouth with warm salt water, take over-the-counter pain relievers, and avoid very hot or cold foods. Your dentist may recommend treatments such as draining the abscess, performing a root canal, or extracting the tooth, depending on the severity. Antibiotics may also be prescribed to prevent the infection from spreading. Always follow your dentist's instructions and complete the full course of antibiotics. Maintaining good dental hygiene can help prevent future infections.