Root canal or endodontic therapy is needed when the pulp/nerve of a tooth becomes infected or inflamed because of bacterial invasion or physical injury. The inflammation and infection will sometimes cause pain, however, infectioncanstill be present even if there are no symptoms. During the root canal process, the nerve is cleaned out and the tooth is disinfected. A specialist is occasionally needed to perform this service and we will refer you to one if we feel that will render the best outcome. After root canal therapy, the tooth will usually require a crown to restore it and protect its structure.