Dental neuralgia is caused by acute and chronic inflammatory stimulation, which gradually transforms from problems in the pulp to inflammatory stimulation of the apical nerve leading to dental neuralgia, and requires nerve killing when the pulp is injured. Nerve killing is a way of removing necrotic pulp and material from the root canal and filling it, as appropriate, to prevent further lesions from occurring. There are three main types of teeth that need nerve killing, one type of tooth decay has reached the pulp and has severe pain, especially when hot or cold stimulation is more painful, another type is periapical inflammation, such problems need to be identified with the cooperation of dental films, and the last type is completely exposed pulp due to trauma, such need to go to the dentist in time. Before killing the nerve, it is necessary to determine whether the nerve has lost its vitality, if the nerve is completely free of irritation signs, then the procedure can be performed, if there is still an irritation reaction, then the cleaning of the infected tissue is performed under local anesthesia, if the infection is serious it needs to be treated with anti-inflammatory treatment first before the procedure. Most patients do not feel any discomfort after surgery, occasionally there is slight pain and bleeding, which can be observed with the use of anti-inflammatory drugs to promote recovery to avoid secondary infection. After the dental nerve is killed, it will no longer be sensitive to hot and cold. It is important to do a good job of cleaning the teeth to avoid periodontal disease, rinse the mouth after meals, and do regular scaling to solve problems such as dental calculus.