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Sometimes the nerve inside the pulp chamber of a tooth becomes necrotic (no longer vital) due to trauma, decay, or even previous dental treatment. The patient may have pain and swelling if this occurs. This is simply the body’s reaction to the dying tooth. If this happens and the tooth is restorable, the dentist may recommend root canal treatment followed by a core build up and a crown. The root canal is the housing for the pulp/ nerve of the tooth. The dentist must enter the canal with special instruments and remove all the connective tissue and nerves in the pulp. Once the canal is hollow, a rubbery material is placed in the canal and the dentist will close the access with other restorative materials. Because the blood supply has now been removed from the tooth, it can become brittle risking future fracture. Therefore the dentist will usually recommend a crown to help protect it from breaking.