The ringing of the bones when opening the mouth is a syndrome of temporomandibular joint disorder because this joint is adjacent to the external ear canal and is accompanied by a painful sensation, and many people go to the hospital with an earache. It may be caused by the disorder of the jaw joint function due to mental factors, or often biting hard objects, resulting in a disorder of the joint function caused by the disorder of the disease. This disease will not only appear when opening the mouth to hear the sound of bones, but also have localized soreness and pain, when opening the mouth will be accompanied by pain. In this case, you can take some painkillers such as ibuprofen and other medicines to treat joint pain, rest the joints by moving them less, and eat less hard food.