There are many causes of jaw dislocation, such as physiologic factors, trauma, decreased muscle function, and medical factors. 1. Physiological factors: the patient’s behavior such as laughing, chewing too hard food, yawning, and eating with a big mouth may lead to dislocation of the jaw. 2. Trauma: dislocation of the jaw may also be caused by the impact of external forces on the jaw, which leads to dislocation of the jaw. 3. Decline in muscle function: dislocation of the jaw may also be due to the decline in muscle tone and ligament function in the elderly, which can lead to dislocation when laughing or opening the mouth. 4. Medical factors: the patient may be due to open-mouth surgery, resulting in the use of the mouthpiece for too long, which may lead to the phenomenon of jaw dislocation, such as prolonged tooth extraction surgery. There are many reasons for dislocation of the jaw, after the appearance of dislocation of the jaw, the patient should go to the hospital in a timely manner to improve the examination, a clear diagnosis, and take the reset treatment in a timely manner, and should not be delayed in order not to lead to adverse consequences.