The main purpose of nerve extraction is to treat inflammation of the nerve of the tooth due to trauma, pulpitis, caries, etc., to protect the tissues around the root tip of the tooth or to preserve the pulp and to relieve tooth pain. If the tooth has pulp necrosis and root tip lesion due to pulp inflammation, trauma or caries, the pain should be relieved and the lesion eliminated by root canal treatment in time. The extraction of the nerve is the 1st step of root canal treatment, and commonly used methods include pulp inactivation treatment or pulp extraction treatment. After the nerve is extracted, the inflammation of the pulp can be controlled to a certain extent and the pain can be relieved. However, it is necessary to continue root canal enlargement, disinfection, and filling after nerve extraction in order to eliminate the inflammation produced by the tissues around the root tip of the tooth and preserve the tooth as much as possible. Before extracting the nerve, you should choose a regular dental hospital to improve the oral examination, make a clear diagnosis, choose a suitable way of extracting the nerve under the guidance of the physician, and carry out root canal treatment as soon as possible.