Root canal treatment cannot be said to be killing the nerve of the tooth. Killing the nerve of the tooth is only a part of root canal treatment, which also includes pulp extraction, root canal shaping, flushing, root filling, and so on. 1. Killing the nerve: It is the first step of root canal treatment, which requires local anesthesia injection, followed by opening the pulp and placing inactivation agent, that is, killing the nerve and relieving the pain. 2. Pulp extraction: The pulp tissue is directly removed, and the nerve is killed before extraction, so the whole process is painless. 3. Root canal shaping: mainly means expanding the shaping and then preparing the root canal. 3. Rinsing: After one month of root canal, you need to rinse with water pipe to clean up the local residual tissue and prevent secondary infection. 4. Root filling: After the above treatment, the cavity needs to be filled with medication, and then the final operation is carried out by closing the tube. Root canal treatment operation is more complex, and also has a certain degree of difficulty, should be carried out under the guidance of a professional physician.