One of the most typical features of a dislocated tooth, which is commonly referred to as a dropped jaw and is professionally known as TMJ dislocation, is the difficulty in occlusion. Patients with TMJ dislocation cannot regain their bite on their own, even if they use their hands to slightly support their jaws to bring the bite into a normal position. The patient’s entire face becomes elongated, the lower jaw extends forward, and speech is slurred. There may be drooling, pain and swelling at the bilateral joints, and a depression in the corresponding preauricular area. For TMJ dislocation, it is recommended to go to a professional dentistry department as soon as possible and have the TMJ dislocation manually reset by a professional dentist, and at the same time protect the joint to avoid opening the mouth widely again.