The most common are malocclusion and facial deformity. In addition, the manifestations of peripheral nerve injury caused by surgery or fracture itself include: infraorbital nerve injury, numbness of lower orbit, upper lip and nose; The inferior alveolar nerve is injured, and the ipsilateral lower lip can feel numb. Limited mouth opening. After jaw fracture, due to pain, fracture segment displacement, masticatory muscle movement disorder, reflex spasm, temporomandibular joint injury and other reasons, mouth opening is limited. Especially mandibular fracture, has a great influence on mouth opening movement. In addition, infection is a common complication of open reduction of jaw fracture, which can lead to poor fracture recovery and even the formation of dead bone. Oral ulcer is also a postoperative sequela, which is caused by intermaxillary traction after fracture and fixation with hooked dental arch splint.