It should be a case of pericoronitis of the wisdom tooth. Treatment principle: In the acute stage, the treatment should be based on anti-inflammation, analgesia, incision and drainage, and enhancement of systemic resistance. When the inflammation turns into the chronic stage, if it is an obstructed tooth that is impossible to erupt, it should be extracted as soon as possible to prevent the recurrence of infection. I. Local irrigation. The treatment of wisdom tooth pericoronitis is focused on local treatment, local and to remove food debris, necrotic tissue, pus in the gingival pockets, commonly used saline, 1%-3% hydrogen peroxide solution, 1:5000 potassium permanganate solution, 0.1% chlorhexidine solution repeatedly rinse the gingival pockets until the overflow liquid clear, dry local, with a probe dipped in iodine glycerin into the gingival pockets, 1-3 times a day, and use compound chlorine The gingival pouch should be rinsed repeatedly with chlorhexidine solution until the overflow is clear. Second, according to the degree of local inflammation and systemic reaction and the presence of other complications, the choice of antibacterial drugs and systemic supportive therapy. It is recommended that these antibacterial drugs should be chosen carefully during lactation. Third, incision and drainage. If an abscess is formed near the gingival flap, it should be incised and drained promptly. Fourth, pericoronal gingival flap excision. When the acute inflammation subsides, the wisdom tooth with sufficient eruption position and normal tooth position can be removed under local anesthesia to eliminate the blind pocket by removing the pericoronal gingival pocket of the wisdom tooth. Fifth, mandibular wisdom tooth extraction. In order to avoid the recurrence of pericoronitis, the mandibular wisdom tooth should be extracted as soon as possible if it is not properly positioned and does not have enough eruption position.