Tooth extraction is mainly aimed at cases where there are lesions on teeth and periodontium, blocked teeth, misaligned teeth, as well as trauma that causes damage to teeth that cannot be repaired. However, improper operation of medical personnel or improper patient care may lead to some hazards, such as bleeding, infection, etc., and in serious cases, it may also cause damage to adjacent teeth and teeth in the opposite jaw: 1. 2. Infection: If foreign objects such as broken pieces of teeth and tartar remain during tooth extraction, or if no attention is paid to oral hygiene after extraction, it is easy to cause infection and symptoms such as redness, swelling, pain, pus, fever, etc.; 3. Damage to adjacent teeth and opposing teeth: When extracting teeth, due to crowding or abnormal position, the operation is relatively difficult, which may cause different degrees of damage to adjacent teeth or opposing teeth, such as loosening, falling off, root fracture or dislodging of fillings, etc.; 4. 4. temporomandibular joint dislocation: during tooth extraction, due to prolonged mouth opening or strong pressure on the jaw, especially for patients with a history of habitual temporomandibular joint dislocation, temporomandibular joint dislocation is easily triggered; 5. other: during tooth extraction, due to patients’ excessive tension and fear, or tooth extraction in fasting state, intraoperative syncope may occur, manifested as pale face, weakness of limbs, cold sweat and other symptoms. Symptoms such as facial swelling, pain and fever may also occur after tooth extraction, and if the symptoms are serious, seek medical attention in time.