A fracture of the jaw is a minor injury, but it is not just a minor injury. If the fracture of the jaw is simple, it can be considered a minor injury, but if the fracture of the jaw causes changes in the face, such as impairment of speech, chewing or swallowing, the fracture of the jaw is not only a minor injury, but may be a serious injury. In clinical practice, X-rays or CT findings are usually used to determine whether a fracture of the jaw has occurred and to determine the severity of the fracture. For example, a simple fracture of the mandible, which is only a fracture and does not cause displacement of the broken end of the mandible, and the patient’s face does not change dramatically, and there is no certain impairment of chewing or swallowing language, can be judged as a minor injury. If the patient has a fracture of the mandible and the fracture end is significantly displaced, and the patient’s facial appearance has changed, and there is a functional impairment of speech, chewing or swallowing, the fracture of the mandible will be judged as a serious injury.