A dead nerve is a necrotic pulp that needs to be removed. If the pulp is necrotic, the necrotic pulp needs to be removed and then root canal filling treatment is performed. If the necrotic pulp is not removed in time, it is likely to cause inflammation, swelling and pain in the gums, and even resorption of the alveolar bone, which makes the tooth more prone to loosening and falling out. Moreover, when the pulp is already necrotic, the tooth is basically a bad tooth, and even if it is not removed, it is unlikely to return to a healthy state. After the pulp is necrotic, it is recommended to go to the dentist of a regular hospital as soon as possible, to be examined by a professional dentist, to clearly diagnose the degree of damage to the tooth, and to take timely and targeted measures to deal with the problem. After the dentist removes the necrotic pulp, disinfection measures should be taken in a timely manner to avoid infection, and also actively cooperate with the dentist to carry out subsequent root canal filling treatment to repair the tooth in a timely manner.