[Lack of healing following adequate endodontic treatment].

When an endodontic treatment is to be redone, generally the X-ray reveals some form of poor or inadequate filling. Most endodontic cases fail because of inadequate endodontic treatment (cleaning, shaping, filling). However, sometimes good clinical treatment isn't followed by healing! This article sums up the possible reasons to consider. In order to improve the success rate of the endodontic treatments, practical hints are given regarding the non-surgical as well as the surgical (re)treatments.