The assurance of the quality of a service rendered by a member of the dental profession is an essential feature of any system of peer review in dentistry. This document addresses two essential elements: (i) appropriateness of treatment modality and (ii) quality or level of treatment rendered. In revising these guidelines the European Society of Endodontology is responding to a public and professional need. In receiving care of a specialized nature such as endodontic treatment, patients need and deserve treatment that meets the standard of care generally given by competent practitioners. The European Society of Endodontology has the expertise and professional responsibility necessary to assist the dental profession by instituting guidelines on the standard of care in the special area of Endodontics. In accepting this responsibility the European Society of Endodontology formulated treatment guidelines that are intended to represent current good practice.