The chin nerve, lingual nerve, nasopalatine nerve, buccal nerve, and inferior alveolar nerve may be damaged during extraction. Due to the large number of anastomotic branches of the nerve, the nasopalatine and buccal nerves are usually not affected even if they are cut. However, injury to the chin nerve, lingual nerve, and alveolar nerve will produce different symptomatic manifestations. Before tooth extraction, a panoramic film or CT can be taken to determine whether there is a possibility of nerve damage. In addition, nerve injury caused by tooth extraction can also be judged according to the patient’s symptom performance as follows: 1. Chin nerve injury: the main symptom is numbness and painful sensation of the skin of the chin; 2. Lingual nerve injury: the main symptom is numbness and delayed sensation of the tongue on the side of tooth extraction; 3. Dental nerve injury: the main symptom is incomplete numbness of the skin of the lower lip and chin, or accompanied by burning and tingling sensation, which will appear spontaneous pain, nocturnal pain, throbbing pain with radiating pain, and also visible redness and swelling of the gums. If the above manifestations occur, nerve-nourishing drugs, such as vitamin B12, should be taken under the guidance of the doctor after tooth extraction, which usually need to be used for 3-6 months. If the numbness improves, the nerve is basically restored. At the same time, you need to pay attention to oral hygiene, usually brush your teeth effectively, rinse your mouth after meals, develop good habits, and use anti-bacterial and anti-inflammatory mouthwash every morning and evening. During this period, do not eat foods that can easily lead to fire, and eat more fruits and vegetables to replenish vitamins.