The steps of root canal treatment are pulp opening, pulp top removal, root canal exploration, complete pulp extraction, root canal preparation, root canal irrigation, removal of decayed pulp, debris and infected material in the root canal, root canal disinfection, root canal sealant, elimination of inflammation, and finally, after the inflammation has completely disappeared, the root canal is permanently filled to isolate external stimulation and prevent re-infection. The cost of root canal treatment is mainly related to the number of root canals, each root canal is about 300 RMB, if the anterior teeth and mandibular premolar teeth are generally single root canals, the cost is about 300 RMB; the maxillary premolar teeth are double root canals, the root canal treatment cost is about 600 RMB; the molar teeth are 3-4 root canals, the treatment cost is about 900-1200 RMB.