Fractures of the jaw are usually caused by direct violence to the jaw, such as a fall or a direct hit or blow to the ground. Most of the fractures are localized fracture fractures, which can be treated conservatively by using a wire to tie the position of the teeth in the lower jaw to have an external fixation. In addition, if the fracture is significantly misaligned, the position of the teeth in the jaw can be seen to be separated or displaced back and forth, and it is usually necessary to make an incision to reset the fracture and use a plate to do internal fixation.