Our primary goal is to save your natural teeth whenever possible. Endodontics is the treatment of the pulp and surrounding tissues of a tooth. When root canal therapy is performed, the pulp chamber of the tooth is removed and then filled with a suitable filling material. Root canals are most often necessary when decay has reached the nerve of the tooth or the tooth has become infected. People have anywhere from 1 to 4 canals in a tooth. Extra canals may branch out and are called “accessory canals.”