Root canal filling generally costs around eight hundred to two thousand dollars depending on the number of root canals, with some variation in cost, it is recommended to refer to your local healthcare provider. Root canal filling is one of the steps of root canal treatment. Root canal treatment (i.e., nerve extraction treatment) is mainly used to treat pain and other symptoms caused by endodontitis or apical periodontitis; it mainly consists of root canal preparation, root canal sealing, and root canal filling, i.e., root canal filling is the last step of treatment. Root canal filling is the last step of the treatment, which involves mechanical preparation of the root canal and sealing of the root canal with medication, and then filling the root canal with specialized root canal filling materials (mainly cementum tips) in order to isolate the root canal from external infection by bacteria and other substances. Depending on the number of root canals, the cost is around $800 to $2,000. Anterior teeth usually have a single root canal, which costs around $800, while posterior teeth usually have three canals, which are usually charged according to the number of root canals, and three canals cost relatively more.