Final answer:
A nail tip application and abrasive are used in a manicure; proper hygiene requires washing under the nails, where a nail brush can aid in cleaning.
Step-by-step explanation:
A nail tip application and abrasive are used to perform a process known as a manicure. Manicures often involve cleaning and shaping the nails, and possibly applying a decorative element such as nail tips. In a broader context, the principles of personal hygiene emphasize the importance of cleaning not just the surface of our hands, but also under the fingernails where bacteria can accumulate. Hand washing should include lathering soap on all parts of the hands and under the nails for at least 20 seconds to ensure that dirt and microorganisms are removed, potentially using a nail brush for more effective cleaning under the fingernails.