Where should a nail rasp be used during a pedicure service?

A nail rasp is a specialized tool designed for use on the undersurface of the free edge of the toenails. During a pedicure, its purpose is to smooth and refine this area, especially if there are rough edges or build-up from calluses. Using a nail rasp under the free edge helps ensure that the toenail feels comfortable when wearing closed-toe shoes and allows for improved aesthetics.

The other choices relate to areas that are not appropriate for the rasp's intended use. The cuticle area is generally treated with softer tools designed to push back or gently remove dead skin. Using a rasp on the top surface of the nail could cause damage or significant abrasion, as it is designed for more hard and thickened areas like the undersides of nails. Lastly, while the side walls of the toe may require some attention during a pedicure, they are not the optimal area for a rasp, which is specifically meant for addressing tough, thick portions of the nail or underlying skin.