Abstract: A cutting element for an endodontic tool is made from an elongated member having a plurality of notches formed along the length of the member. The member is twisted into a helical pattern. The twisted member defines a cutting element which combines the best properties of a conventional dental file, a reamer, and a Hedstrom file, in a single instrument. The number and depth of the notches can be varied, to control the flexibility of the cutting element. Thus, the instrument can be made of a hard metal, such as stainless steel, but the instrument can still be made flexible by proper choice of the dimensions of the notches. The shape of the notches can also be varied to provide an instrument which cuts only during a "push" stroke or a "pull" stroke. The invention saves time and reduces the cost of dental procedures, by providing a tool which can be used in place of three tools of the prior art.