Temporomandibular joint dislocation refers to the movement of the mandibular condyle that exceeds the normal monthly limit and dislodges from the joint concavity without being able to return to the position by itself. The dislocation is mostly anterior in clinical practice, and can occur unilaterally or bilaterally. Anterior dislocation of the temporomandibular joint often occurs due to sudden over-opening of the mouth, such as laughing, yawning, or excessive use of the mouthpiece when the mouth is opened for too long, such as for oropharyngeal examination or surgery, which causes the condyle to dislocate from the articular recess and move in front of the articular structure. The patient presents with abnormal jaw movement and an open mouth but wishes not to close it. Speech is unclear, salivary outflow, and difficulty in chewing and swallowing is encountered. The lower jaw extends forward, the frontal area shifts downward, and the facial shape is relatively long. A depressed area can be palpated in front of the ear screen on palpation. In unilateral anterior dislocation, the lower jaw extends slightly forward and the midline of the chin deviates to the healthy side. Treatment of temporomandibular joint dislocation: the operation method of manual repositioning: the patient sits in a low position with his head against the back of the chair or the wall, and the occlusal surface of the mandibular teeth should be lower than the elbow joint when the two arms of the tense operator are down. The operator stands in front, both thumbs (can be wrapped with gauze) are placed backward on the occlusal surface of the mandibular molars on both sides, and the rest of the fingers hold the mandibular body. The patient is instructed to relax the muscles during the repositioning, and the operator gradually presses the posterior end of the mandibular body downward with both thumbs, while the remaining fingers lift the chin slightly upward. When the condyle drops below the level of the articular tuberosity, the mandible is pushed backward and the condyle slides back to the concave surface of the joint. Immediately after repositioning, the patient is fixed with a cephalomandibular bandage and mouth opening activities are restricted for about two weeks. Before resetting, attention should be paid to eliminate the tension of the patient’s awareness. Sometimes the temporalis and occlusal muscles can be massaged, or 1-2% procaine can be used to close the inferior temporal trigeminal nerve or periarticular area to help reset. For old dislocations, it is necessary to reset under general anesthesia if necessary, or even really difficult to reset by surgical incision.