Root canal therapy is the preferred method for the treatment of endodontic and periapical diseases and is technically difficult. When choosing root canal treatment, the patient should pay attention to the following matters: 1, in general, root canal treatment requires several consultations to complete and lasts for a long time, and should be followed up in a timely manner according to medical advice, otherwise it will affect the efficacy and course of treatment. 2.If the tooth is seriously damaged, such as the appearance of periapical shadows, the disease is difficult, the number of treatment and consultation time may increase. 3.The cost of treatment depends on the number of root canals of the affected tooth. The more the number of root canals, the more difficult it is. 4, the condition is complex, the treatment of difficult teeth, such as root canal curvature, inaccessible, treatment may not be root filling treatment, broken instruments or even root canal sidewalls through the situation, if you need special instruments, the treatment cost will be increased accordingly. 5.In order to carry out the treatment smoothly, it is necessary to drill a hole in the affected tooth to facilitate the view and easy operation. 6.In order to ensure the efficacy of the treatment, usually one dental film is taken before, during and after the treatment. 7.During the treatment period, the affected tooth should not be used to chew harder food, so as not to cause the sealant to fall off or the affected tooth to fracture. 8.During the treatment period, there may be pain or even facial swelling or other complications of the affected teeth.