The steps for a root canal on a tooth are root canal preparation, root canal sealing, and root canal filling, which can cost anywhere from a few hundred dollars to thousands of dollars. 1. Root canal treatment is a treatment for endodontics and periapical disease, which removes infected material from the root of the tooth and then tightly fills the root canal to prevent reinfection. It is divided into root canal preparation to enlarge and shape, root canal sealing to control infection, and root canal filling to prevent re-infection. 2. The cost of root canal treatment is related to the number of roots, according to the number of roots, the cost of multi-root canal posterior teeth is higher than the cost of single-root canal anterior teeth, about a few hundred dollars for single-root teeth and thousands of dollars for multi-root teeth. Therefore, the steps and cost of root canal treatment are related to the number of roots, and you should refer to the specific local charges.