Cutting the nerve of a tooth, i.e. root canal treatment, is generally painless, but individual variability cannot be ruled out. Cutting the nerve of a tooth is performed under anesthesia and is therefore painless. However, some people who are tolerant to anesthetics and have strong nerve vitality may feel pain when the nerve is removed after anesthesia is injected, so it is best to inactivate the nerve with a sealing agent before removing the nerve. It is normal to experience mild pain for a week after root canal treatment, and the discomfort usually subsides after three days. At the same time, do not eat hard food within a week after the operation, pay attention to oral hygiene, you can rinse your mouth with light salt water immediately after meals, but also to develop a good habit of brushing your teeth in the morning and evening, and pay attention to the correct method of brushing your teeth. It is recommended that after cutting the nerve of the teeth should be strictly in accordance with the provisions of the doctor for regular checkups, if there is any abnormality should be timely consultation, so as to avoid delays in the condition.