A root canal is really the part of the tooth that runs from the center, down along the root, to the end. The root canals hold the nerves of the teeth. When tooth decay or other damage causes otherwise irreversible stress to the nerve, root canal therapy is applied.
Root canal therapy has gotten a bad rap over the years, when in reality it is usually achieved over one or two Denver dental care appointments, and with the use of modern anesthesia, is really not that bad. It is often the only way to save a traumatized, or aging tooth from extraction.