A root canal is a procedure that can help restore the interior of the tooth to relieve pain and save your smile. Also called endodontic treatment, a root canal is necessary when the nerve of the tooth becomes inflamed or infected. A root canal saves your tooth by replacing the infected tissue with a rubber-like material, which is later protected with a filling and crown. From there, the tooth will function and feel like any other. A root canal can often be completed in one or two sessions and is a more comfortable experience than many people believe.