Root canal treatment is an endodontic procedure used to clear infected pulp away from the pulp chambers and canals of a diseased tooth. Infections occur when bacteria are allowed to enter the pulp – often due to untreated decay or a crack in the tooth. During a root canal, the tooth is opened and the pulp removed. Biocompatible cement is used to fill the tooth before it is restored with a crown or other restoration. You may need a root canal if tooth decay or a broken tooth has allowed the pulp to become infected and inflamed. Signs and symptoms to watch out for include temperature sensitivity, swelling, drainage, odor, pain, and discoloration of the tooth. It is important to treat infections quickly, as delaying treatment can result in severe tooth pain and abscess.