Which instrument is used supra- and subgingivally, with two cutting edges, and a rounded toe?

• A. Gracey Curette
• B. Air Polisher
• C. Universal Curette
• D. Sickle Scaler

Answer: (C)

This description points to the universal curette. Its blade has two cutting edges, which allows effective scaling on all tooth surfaces, and its rounded toe helps it glide along root surfaces without gouging tissue, making it suitable for both supra- and subgingival instrumentation. That combination—two cutting edges plus a rounded toe and the capability to work above and below the gum line—defines its versatility for comprehensive root planing and scaling.

Gracey curettes also have a rounded toe, but they are designed with a single cutting edge active on a given instrument, tailored to specific surfaces rather than used across the whole dentition. Sickle scalers have two cutting edges as well but a pointed tip and are typically used supra-gingivally, not ideal for subgingival root planing. An air polisher isn’t a curette at all and is used for stain removal rather than subgingival instrumentation.