A dental endpiece designed to be attached to a rotary or reciprocating dental power tool handpiece to debride and enlarge the root canal and smooth its walls by cutting or abrasion. It is made of metal [e.g., stainless steel, nickel-titanium alloy (Nitinol)] and its working end has a polygonal cross-section with edges. It may also be referred to as a rotary or engine file, or reamer. This is a reusable device.