When there is excessive pus, an incision and drainage needs to be performed. Periodontitis is a pathological condition of the dental supporting tissues caused by both dental plaque and tartar, resulting from poor oral hygiene, incomplete brushing, and the accumulation of dental plaque and tartar, which irritates the gum tissues and causes inflammation. If there is excessive pus, it is necessary to go to a regular hospital's dental department for incision and drainage. The procedure can be performed under local anesthesia, which is painless. The area is repeatedly rinsed with hydrogen peroxide and saline, treated with iodine glycerin, and oral medications such as cephalosporins and metronidazole are taken. Use compound povidone-iodine solution for mouth rinsing. Once the inflammation is controlled, systematic periodontal treatment can be performed, including supragingival cleaning, subgingival scaling, root planing. Regular oral hygiene should be maintained, brushing teeth in the morning and evening, rinsing the mouth after meals, and learning to use dental floss sticks. (Medication should be used under the guidance of a physician.)