a dental specialty, which deals with the treatment of root canals. Endodontic treatment is performed on teeth which have due to progressing dental caries, injury or other mechanism developed an infection or irreversible damage to the dental pulp including the nerve. First, we need to gain access to the pulp chamber. After having cleaned the pulp chamber, we find the openings of the root canals. The canals are unblocked, extended, thoroughly disinfected and finally dried and filled hermetically. Thus, it is one of the last ways how to save the tooth.