Root canals, also known as endodontic therapy, are performed when the nerve or pulp of the tooth becomes infected and inflammed due to dental decay, a cracked or broken tooth or an injury to the tooth, according to the American Dental Association. During the procedure, a dentist uses a drill to remove both the nerve and pulp and seals up the tooth to protect against further damage. Only professional dentists can determine whether a root canal will adequately treat your proble