ROOT CANAL (Endodontics) Root Canal, or endodontics, is the process of removing the nerves from the roots of a tooth.  A root canal is often necessary to save an infected tooth.  If an infected tooth is left alone for a long period of time, an abscess can form.  An abscess will show up on an x-ray as a dark spot below the apex of the root.  This is actually bone loss in the jaw.  It is very important to catch this problem before it deteriorates too far. Process The doctor will determine a working length of each canal.  Each canal is then cleaned and shaped in preparation for the filling material.  Once each canal is prepared, it is filled with an inert material called gutta percha.  The canals are then sealed.  The tooth is now ready for a restoration, which is usually a crown.  This entire procedure is often completed in two visits.