Endodontic retreatment is a process whereby the endodontist removes the existing root canal material by creating a small access hole on the tooth surface. After removing the filling material with small files and irrigation solution, your endodontist will clean all of the canals. The tooth will be examined carefully for any new infections or additional canals. Any infections are removed, and the canals are cleaned and shaped. Next, new filling materials are placed and the endodontist will seal the opening with a temporary filling. However, if the canals are uncommonly narrow or impassable, your endodontist might recommend endodontic surgery to access and seal a portion of the root tip (please see microsurgery page for further information).