One Shape allows for curved canal negotiation with an instrumental and easy dynamic, while its nonworking (safety) tip ensures an effective apical progression. Minimal fatigue along the length of the file virtually eliminates the risk of separation. The instrument presents a variable cross-section along the blade with 3 different cross-section zones. The first zone presents a variable 3-cutting-edge design. The second, prior to the transition, has a cross-section that progressively changes from 3 to 2 cutting edges. The last (coronal) is provided with 2 cutting edges. Recommended for the treatment of a single tooth, the One Shape file can be used with a traditional endodontic handpiece or any other endodontic motor with continuous rotation.