The Authors, after having underlined the importance of the endodontic discipline, that allows to obtain a reliable rehabilitation, illustrate the Schilder technique, used by them at the Odontoiatric Clinic, University of Brescia. The AA. take into consideration and face the problem of the reintervention on channels already treated, as well as the periapical infections complication. They conclude saying that endodoncy is an extremely difficult discipline, because it implies a lot of experience, practical ability and a constant application.