It is possible that the mouth does not open well after tooth extraction is caused by the injury of temporomandibular joint and reactive edema, which can be treated with medication or surgery according to the condition. 1. TMJ injury: If temporomandibular joint dislocation occurs, joint repositioning and internal fixation is required. At the same time to follow the doctor’s instructions oral cephradine, amoxicillin and other drugs for anti-inflammatory, as well as ibuprofen and other drugs for pain relief, generally can be improved. At the same time, try to open the mouth as little as possible, reduce the movement of the joints. 2. Reactive edema: refers to the local tissue serious edema, hematoma or abscess, you can use cold compresses and hot compresses, at the same time take ibuprofen and other anti-inflammatory drugs for pain relief, redness and swelling will gradually disappear. If there is an abscess, it is necessary to carry out a systemic intravenous drip or intramuscular injection, so as to relieve, and then the mouth will slowly open. It is recommended to go to the hospital in time to see a doctor under the guidance of standardized treatment. During the treatment, you should pay attention not to eat hard food, and do not eat spicy and stimulating food.