Which principle should a manicurist follow to maintain personal hygiene and grooming?

The principle that a manicurist should follow to maintain personal hygiene and grooming is the Rule of healthful living. This principle encompasses practices that promote overall health and well-being, which are essential in the beauty industry, particularly for professionals who provide close personal services such as manicures. By adhering to standards of healthful living, manicurists not only ensure their own cleanliness and appearance but also set a positive example for clients and contribute to a sanitized and professional work environment.

In the context of the beauty profession, healthful living can include routine practices such as regular handwashing, maintaining clean and tidy nails, and wearing appropriate clothing that is both professional and hygienic. This principle is vital, as a reputation for good hygiene can significantly impact a manicurist's business success and client retention.

The other options focus on concepts that do not specifically address personal hygiene or grooming in a professional setting. Although they might relate to skills or attributes valued in the beauty industry, they do not prioritize the fundamental need for proper hygiene, which is critical for client safety and health.