The inability to close the mouth with yawning is clinically known as TMJ dislocation and can be treated with prompt medical attention and repositioning. Temporomandibular joint dislocation can be caused by the degree of opening, such as yawning, laughing, etc., manifested as the mouth can not close normally. It is necessary to go to the hospital in time, and the professional doctor will carry out the reset first aid, which can take the craniomandibular bandage reset treatment. After reset, jaw immobilization should be carried out for 2-3 weeks to limit the extent of the mouth. If the effect of manipulation reset is not good, arthroscopic surgery and other ways of treatment can be taken. TMJ dislocation daily attention should be paid to the patient’s rehabilitation training, while monitoring the presence of bite abnormalities and other symptoms of discomfort, the emergence of discomfort should be promptly consulted. It is also necessary to avoid crying, laughing and opening the mouth excessively.