Curettes and punches must be kept sharp for efficient use. Both instruments have circular cutting edges which are easily dulled. The outer surface may be sharpened by rotating the circular edge while it is stroked across a flat whetstone (Figure) used for sharpening needles. The inner surface may be sharpened by twirling a hard pencil-shaped whetstone (Figure) inside the circular cutting edge. Joseph1 used a tapered steel punch instead of a pencil-shaped whetstone. Hard whetstone is probably a more efficient sharpener than steel.
These whetstones, both flat and pencil-shaped, are usually obtainable at hardware stores.
Equitable Building, Suite 905, 6253 Hollywood Boulevard at Vine St. (28).
WATSON JB. Whetstones For Sharpening Curettes and Punches. Arch Dermatol. 1960;82(2):263. doi:10.1001/archderm.1960.01580020105022