Blackened incisors may be caused by necrosis of the nerve, requiring root canal treatment and crown restoration. The impaired blood supply to the local tissues after the impacted incisor may lead to necrosis of the local tissues, and the patient will have the symptom of blackening of the incisor. It is recommended that the patient can take root canal treatment to clear the necrotic tissue in the root canal, and also need to disinfect the local area, and then fill the root canal. For patients who have taken root canal treatment can take crown restoration to improve the symptoms of black teeth. It is recommended to consult a doctor in time after the incisor has been hit and darkened, and the doctor will choose the appropriate measures according to the patient’s dental condition. Usually need to keep the mouth clean, every time after eating need to rinse the mouth in time, in addition patients need to pay attention to the protection of the teeth, to avoid the teeth were hit again.