How long does endodontic root canal treatment hurt is affected by the inflammation of the tooth and the individual’s physique, normal postoperative pain for about a week, if the inflammation can not be controlled then the pain will not be eliminated. 1. Endodontic root canal treatment is operated under local anesthesia, due to the preparation of the root canal and drug rinsing, in the process of operation may stimulate the apical area, when the root canal treatment due to mechanical or drug stimulation, there may be a slight pain in the apical area, usually about a week can disappear. 2. If the root canal treatment is not done successfully and the inflammation is not controlled, it may cause periapical inflammation, and the pain will continue after the root canal treatment, which needs to be changed again. Endodontitis root canal treatment pain how long is also related to the individual’s physical condition, pain sensitivity to pain body resistance is low pain time may be longer.