dental interproximal disk formed of rigid sheet material as a unitary or integrally formed handle portion and blade portion with an arcuate cutting edge. The handle portion includes a plurality of corrugated flutes terminating in a laterally offset flange. The side surfaces of the blade portions may be either smooth or roughened on one or both surfaces thereof. An aperture is formed adjacent one end of the handle portion for attachment of a string or cord to effect retrieving if necessary as a matter of safety.