This scaler is used to remove plaque and calculus from the tooth surface. The sickle scaler tip can be used to remove calculus from the developmental grooves and blood grooves in canine teeth. This scaler is used to remove plaque and calculus from the tooth surface. Use these instruments to remove supragingival calculus. Put the tip third of the scaler's cutting edge against the tooth. Tilt the instrument toward the tooth at a 70–80 degree angle between tooth and blade.