The common factors of numbness of lips after tooth extraction are anesthetic effect has not disappeared, nerve damage. The causes of different treatment methods are also different, and should be timely consultation. Specific analysis is as follows: 1. Numbing effect has not disappeared: under normal circumstances, the effect of anesthesia is generally about two hours, two hours after the numbness will disappear, the extraction of teeth may hit the dental nerve block anesthesia, which will lead to numbness of the lips, and the symptoms will be relieved only after the disappearance of the effect of the drug. This is a normal phenomenon, no need to worry too much. 2. Nerve damage: If the root of the tooth and the nerve position is close, the extraction of teeth may cause some damage to the nerve. The numbness may last for a longer period of time, such as 1-2 months, and then slowly disappear. If necessary, you can also follow the doctor’s instructions to take nutritive drugs to promote nerve healing, such as vitamin B12, vitamin B1, glutamine and methylcobalamin.