Instumentation: For calculus removal place the tip third of the scaler’s cutting edge against the tooth. Tilt the instrument toward the tooth to achieve 70-80 degree angle between the tooth and the blade. Apply lateral pressure and activate the scaler by using vertical, diagonal or horizontal pull strokes. To maintain control use short 2-3mm long strokes. Design: – Triangular cross-section, Face perpendicular to the lower shank, Two cutting edges, Pointed tip.