What is the purpose of a nail brush in filing?

A nail brush is specifically designed to remove dust and debris from the nail surface, making option B the correct response. After filing, nails can accumulate fine particles of dust and shred from the filing process. Using a nail brush effectively clears away these residues, ensuring that the nail surface is clean and prepared for further application or treatment, such as polish or enhancements. Maintaining cleanliness is crucial in nail care, as it promotes better adhesion of products and a more polished final appearance.

The other options relate to different aspects of nail care but do not accurately represent the primary function of a nail brush. Adding texture to the nails is typically achieved through filing techniques or nail art, and polishing is done with a different tool or method entirely. Assisting in pushing back cuticles is usually done with a cuticle pusher or stick, which is a separate instrument designed for that purpose. Thus, the nail brush serves a specific role in nail filing by ensuring cleanliness and preparation of the nail surface.