What safety measure should be taken when using a dental handpiece for polishing?

Using a dental handpiece for polishing requires attention to safety measures to prevent infection and ensure the tool functions properly. Ensuring proper maintenance and sterilization before use is critical because dental handpieces can harbor bacteria and other pathogens if they are not adequately cleaned. This sterilization process protects both the patient and the dental professional, creating a safe environment for procedures that involve direct contact with oral tissues.

The other options suggest practices that could compromise safety. Keeping equipment unsterilized increases the risk of cross-contamination and infection. Using a dental handpiece without protective equipment could expose the operator to splatter or debris, creating a safety hazard. While using a handpiece only on healthy teeth might seem appropriate, it doesn't address the potential risks associated with unsterilized or poorly maintained equipment. Proper maintenance and sterilization are foundational to safe dental practices, emphasizing infection control and equipment reliability.