If the nerve is the nerve of the pulp inside the tooth, the nerve can be completely removed by tooth extraction. After the tooth is extracted, the entire inner cavity of the tooth is the pulp, which is rich in what is usually called the dental nerve. Once the tooth is extracted, the nerve is removed from the body, but the rest of the nerve, including the periodontium and the inferior and superior alveoli, remains in the body, that is, only the nerve of the corresponding tooth is removed, and the rest of the nerve remains intact in the body.