The meat behind the wisdom tooth may be swollen by a variety of causes, commonly caused by wisdom tooth pericoronitis and acute periapical inflammation caused by the surrounding tissue swelling, there may be oral tumors and other causes, it is recommended to go to the Department of Dentistry to clarify the cause of treatment. 1, wisdom tooth pericoronitis: refers to the occurrence of soft tissue inflammation around the wisdom tooth, most due to incomplete eruption of wisdom teeth, there will be swollen gum tissue, severe pain in the posterior tooth area, accompanied by Salty discharge or pus exudation from the periodontal pockets, and in severe cases, the pain is aggravated by eating and swallowing. The blind band can be repeatedly rinsed with chlorhexidine and saline until it is clean. It can also be combined with debridement to remove bacterial plaque, stones and necrotic tissue. If there is local abscess formation, incision and drainage should be made and drainage strips placed to avoid the spread of inflammation. It should also be combined with thorough treatment with antibacterial drugs for anti-inflammatory or surgical extraction; 2. Acute periapical periodontitis: swelling of the tissue around the wisdom tooth occurs, and as the inflammation increases so that the affected tooth has a floating sensation and pain, and the pain is spontaneous and continuous throbbing pain, which can affect sleep or eating in severe cases. In the acute stage, the pulp cavity should be opened and drained to relieve the pain. The root canal treatment should be performed to remove the inflammatory pulp and necrotic tissue, and disinfection and filling. 3. tumor: the swelling behind the wisdom tooth may also be a tumor, and the diagnosis should be confirmed by routine blood tests, tumor markers, pathological smear and X-ray, and surgery, radiotherapy and chemotherapy should be performed according to individual differences.