It is a process employed to save a tooth that would otherwise need to be removed. It is generally caused by an infection in the pulp, or “living tissue,” within the tooth, and it must be treated since it has gotten infected which is no longer effective in curing itself and is rotting off. In most cases, the infection causes discomfort in and around the tooth, as well as possibly in the jaw. Many patients initially detect sensitivity in their mouth when they consume hot or cold food or drinks, and it generally lasts for a while. Swelling or pain in the gums is also possible, and the tooth itself could become discolored or darker beyond usual. All these are indications that you may require root canal therapy to treat your infection.