Root canal treatment necessitates the extraction of the tooth’s nerve. Nerve extraction is the first step of root canal treatment. Only after removing the nerve can the infectious material in the root canal be removed to achieve a certain therapeutic effect, commonly used methods include pulp inactivation therapy or pulp extraction therapy. Inflammation can be controlled to a certain extent after the nerve is extracted, after which it is necessary to continue to expand, disinfect, and fill the root canal in order to eliminate the inflammation produced by the surrounding tissues. Root canal treatment requires regular follow-up appointments as prescribed by your doctor, as well as avoiding chewing food on the affected side and repeatedly poking the sealing material with your hands, toothpicks or dental floss during treatment. If chunks of the sealing material come off, it will need to be re-sealed with medication. It is normal to experience mild pain for 2-3 days after root canal treatment. If the pain is significant, seek medical attention. Before root canal treatment, you should choose a regular dental hospital to improve the oral examination, make a clear diagnosis and carry out root canal treatment as soon as possible to avoid delaying the condition.