Avoids screwing effects: the helical angle of the cutting edges varies from the tip to the shank. The new pitch also varies according to the taper: the more tapered an instrument is, the longer is its pitch; This can be described as an ADAPTED pitch. Increased instrument performance :, The blade shows a triple helix cutting edge. The tip is inactive in order to follow the canal anatomy. Improved patient comfort. Time-saving: 10 seconds of use per instrument for efficient shaping. Reduced operator fatigue. Fewer instruments to handle. Reproducible results. Increased safety:, no screwing effect. excellent debris evacuation. , Difficult canals, severely curved, possibly with significant hypercalcification, making any first penetration tricky with the finest hand files. Speed 300 to 600 rpm, Canals of average difficulty with moderate curvature and/or more hypercalcification, making first penetration with a n?10 K file hard to achieve. Speed 300 to 600 rpm, Easy canal preparation, low curvature, orifice, and canal large enough to allow a n?15 K file to reach the Apex. Speed 300 to 600 rpm, Canal treatment of a second lower molar (37). The debridement technique takes account of the flared form of the coronal half. Pulpectomy and endodontic treatment of the upper right molar (17) that respect the initial canal axis perfectly. Endodontic treatment of a second lower left molar. The curve in the apical portion of the mesial canal was negotiated without difficulty. The apical third was flared using a HERO Apical? .06 and .08 sequence.