TMJ dislocation, commonly known as jaw drop, is mainly manifested by the patient’s open mouth, inability to close the mouth, accompanied by salivary outflow, slurred speech, difficulty in chewing and swallowing, inability to bite the front teeth, forward stretching of the jaw, and lengthening of the face. If only one side of the joint is dislocated, the patient will also have a deviation of the chin and lower front teeth to the normal side. Once TMJ dislocation is detected, it should be reset by a specialized doctor in a hospital immediately. The jaw should be immobilized for 2-3 weeks after the dislocation so that the ligaments, disc attachments and capsule can be repaired. If the joint dislocation is not reset in time, after a certain period of time, the soft tissue around the joint proliferates, the chewing muscle spasm, and the old dislocation may occur.