The invention relates to an endodontic instrument for anatomically shaping a root canal of a human tooth, having a base portion, which can be mounted on a holding device and can be rotated around a reference axis A, and having a working part with an abrasive surface, at least a part of which extends from the base member and has an axis which is arranged angular with respect to a reference axis, wherein the central axis of the base portion and the central axis of working portion enclose an angle α greater than zero, and/or wherein the central axis of the working portion is offset in parallel to the reference axis of the base member by a distance r , characterised in that the working part is made of a flexible material having a yield strength of less than 200 MPa.
