When a patient hears a doctor say “your tooth needs a root canal”, there is an inexplicable fear, which I have observed is caused by a lack of understanding of “root canal therapy”. Here I will introduce you some knowledge about “root canal”. Today, I will talk about what you should pay attention to if your tooth needs root canal treatment. 1, in general, root canal treatment requires several visits to complete, and lasts for a long time, so you should follow up according to medical advice, otherwise it will affect the efficacy and course of treatment. 2.If the tooth damage is serious, such as the appearance of periapical dark shadow, the disease is difficult, the number of treatment, the consultation time may increase. 3.In order to carry out the treatment smoothly, it is necessary to drill and grind the cavity on the affected tooth. In order to ensure the efficacy of the treatment, usually a dental film should be taken before, during and after the treatment to ensure that the root canal is clear and the filling is in place. 4.During the treatment period, the affected tooth should not be used to chew food, so as not to cause the sealant to fall off or the affected tooth to fracture. 5.During the treatment period, the affected tooth may have pain or even facial swelling or other complications, which should be accompanied by anti-inflammatory medication, and in serious cases, immediate follow-up should be made. 6.After the treatment is completed, the affected tooth is a dead pulp tooth with no vitality, so it is recommended to do a full crown restoration on the affected tooth to prevent fracture.