Root canal therapy involves removing infected pulp tissue from within the root chamber of the tooth. The pulp is the innermost layer of a tooth and contains blood vessels, nerves, and connective tissue. It can become inflamed from a variety of causes, such as decay, a crack, or injury to the tooth. If left untreated, the infection could cause pain and/or cause an abscess. After removing the infected pulp, the root canals is cleaned and filled with an antibacterial filling. A crown, or another restoration option, is then placed to protect the tooth and restore it to its full function.