A root canal is the more commonly known name for root canal therapy or endodontic therapy. This procedure eliminates the infection found when a cavity reaches deep into the physical hollows of a tooth. Once this type of infection occurs, it needs to be treated since it cannot be healed on its own. The symptoms of an infection in this area of the tooth may include sensitivity to hot or cold or sweets, pain to biting or pressure or swelling. Following the procedure, a restoration such a crown may be recommended to protect the tooth’s remaining structure.