Which implement is specifically used to clean under the free edge of the nail?

The implement specifically used to clean under the free edge of the nail is the curette. A curette is a small, scoop-shaped tool that allows technicians to carefully remove debris, dead skin, and buildup from this area without causing damage to the nail or surrounding skin. This tool's design enables precise cleaning which is crucial for maintaining nail health and hygiene.

While a cuticle pusher is often used to push back the cuticles and can help clean the nail area, it is not primarily designed for cleaning under the free edge. A file is primarily intended for shaping and smoothing the edges of the nails, not for cleaning. A nail brush is useful for cleaning the surface of the nails but does not have the specific design needed to reach under the free edge effectively. Therefore, the curette is the most suitable choice for this particular task, emphasizing its unique function within nail care.