Root canal treatment is generally divided into three steps, the first is root canal preparation, that is, the thorough removal of decayed pulp tissue; the second step is root canal disinfection, that is, the use of disinfectant drugs to kill the bacteria remaining in the root canal; finally, root canal filling and cavity repair, that is, the root canal is tightly filled and then filled, so root canal treatment routinely requires three times. In case of persistent infection, the number of sessions may increase. For teeth with mild apical inflammation, 2 sessions are usually sufficient, and for teeth without infection but needing root canal treatment due to restoration or trauma, 1 session is usually sufficient. As for the cost of treatment, it is determined by the number of root canals in the tooth. Usually the molar is around $800 and the anterior tooth is around 300. If the defect is large, braces are also needed to protect the tooth, and the cost is usually about $1000. The treatment process can be done in a painless way, so don’t be nervous.