Gums grow a pus for more than a year did not go down, may be periodontal abscess, apical periodontitis and other reasons, can be through incision and drainage, root canal treatment, anti-infection treatment and other measures to regulate. 1. Periodontal abscess: periodontal abscess lasts for more than a year and has not subsided, can be incised and drained through local anesthesia to discharge purulent secretions. 2. Periapical periodontitis: It is an inflammatory disease that occurs in the dentin, periodontal membrane and alveolar bone at the root tip of the tooth, which may form a suppurative infection, resulting in pus on the gums, and requires endodontic treatment to remove the pus and change the medication on time. In addition to the above measures, you can take sensitive oral antibiotics, such as metronidazole, cephalosporin, etc., as prescribed by your doctor. Gums grow a pus, more than a year did not go down, it is recommended to go to the regular hospital timely examination, follow the doctor’s instructions for treatment.