Instrumentation: For calculus removal place one of the cutting edges of the universal curette against the tooth surface. Tilt the instrument toward the tooth to achieve 70 to 80 degree angle between the tooth and the blade. Apply lateral pressure and activate the curette by using vertical, diagonal or horizontal pull strokes. Both cutting edges of the same curette can be used by simple tilting the instrument one way or the other. Design: Working end perpendicular to the lower shank, Two cutting edges, Rounded tip.