Root canal treatment is a more basic treatment operation in endodontics, targeting endodontic and periapical diseases, which require root canal treatment because the pulp of both diseases is infected and has no value for preservation. Root canal treatment uses a dental power system to open the pulp of the tooth, which provides immediate relief from the painful symptoms. After the pulp is removed, a special root canal file is used to expand the pulp cavity, and the pulp cavity is filled with the pulp filling paste, which is the whole process of root canal treatment.