If the nerve is damaged in the process of tooth extraction, it will produce corresponding local nerve sensory disorder. If the nasopalatal nerve is damaged, it will cause numbness of the palatal mucosa in the anterior tooth area; if the buccal nerve is damaged, it will cause numbness and pain of the buccal mucosa; if the chin nerve is damaged, it will cause numbness and pain of the skin of the chin; if the lingual nerve is damaged, it will cause numbness and dull sensation of the tongue; and if the inferior alveolar nerve is damaged, it will cause numbness and dull sensation of the tongue. Injury to the inferior alveolar nerve will cause incomplete numbness of the skin of the lower lip and chin, and the ipsilateral mandibular teeth, or accompanied by burning and tingling sensation. Generally, nerve symptoms are gradually relieved and recovered. Oral medications to promote nerve growth and medications to reduce edema, such as dexamethasone and gold lutea, can be taken for about one week to three months, and the nerve will recover to varying degrees.