Root canals are usually pain-free for about a week after they are completed, but the exact amount of time varies from person to person. During a root canal, the doctor will use medication to kill the nerves in the tooth, which can effectively improve the pain. However, during routine root canal filling, some patients may experience biting pain due to mechanical stimulation or irritation from root canal filling materials such as gum tips and pastes, and this pain usually decreases gradually in a week or so until it disappears completely, and generally does not require special treatment. It should be noted that after root canal treatment, a light or liquid diet, such as porridge and rice soup, should be chosen temporarily. You can also rinse your mouth with light salt water after each meal to prevent bacterial growth on the surface of the tooth, resulting in localized infections and thus prolonging the recovery time. If the pain after root canal treatment lasts for a longer period of time and becomes more and more serious, it is necessary to go to the dentist in time to find out the specific reasons to avoid delaying the condition.