The entire process of killing the nerve of a tooth usually involves pulp opening and extraction, sterilization, filling and restoration. 1. Pulp opening and extraction: usually the hard tissues of the crown are abraded to expose the pulp chamber. The patient is usually under local anesthesia, and instruments should be used to completely remove the nerve of the tooth and expand the root canal. 2. Disinfection: Generally, the root canals need to be disinfected after root expansion, and the main medications are calcium hydroxide, wood distillate, etc., and the disinfection is sterilized for about one week. 3. Filling and restoration: Usually after disinfection, the root canal is tightly filled with sterile gum tip and paste. After filling, the pulp chamber can be filled with photosensitive resin and crown restoration can be performed. If patients experience discomfort, it is recommended that they seek medical attention in a timely manner and under the guidance of a professional doctor for relevant examinations and treatments.