The first time a root canal is performed, it will hurt for about 3-4 days. The main treatment for the first time is to open up our pulp chamber and put in the inactivator, which is mainly composed of local anesthesia and inactivator, which will gradually paralyze our nerves and kill them after sealing in. However, the patient will still feel a vague pain in the first few days, which is mostly tolerable and does not cause night pain, paroxysmal pain or radiating pain as in the case of endodontitis, and this vague pain will disappear completely after 3 days, because by this time, the nerve of the tooth has mostly been inactivated. However, if you want the nerve to be completely deactivated, it will take about 10 days, after which the second root canal treatment will be started.