Mandible refers to the part of the jaw that can move when opening and closing the mouth, mainly where the lower teeth are located, mainly supported by the mandible, the mandible is symmetrical, the upper bone is the condylar process in front of the ear, and the lower part is the angle of the mandible on both sides of the front to the chin, and the mandible is able to open and close the mouth is controlled by the masticatory muscles, which help to complete the activities of mastication, swallowing, etc. However, sometimes the jaw is more susceptible to trauma, such as falling or traumatic blows can easily lead to a fracture of the jaw. However, sometimes the lower jaw is more vulnerable to trauma, such as falling or traumatic blows can easily lead to mandibular fractures, sometimes trauma has obvious skin cracks should also be considered whether there is some damage to the bone.