What is the corrective treatment called that provides a protective layer for a damaged nail?

The corrective treatment that provides a protective layer for a damaged nail is known as a nail wrap. Nail wraps are typically made from materials such as silk, linen, or fiberglass that adhere to the nail surface, reinforcing and protecting damaged or weak nails. By applying a nail wrap, you can prevent further breakage and enhance the overall strength and appearance of the nail.

In contrast, a base coat is applied underneath nail polish to improve adhesion and prevent staining, while a top coat is used over nail polish to provide a glossy finish and extend wear time. A nail buffer is used to smooth and shine the surface of the nail but does not provide protection like a nail wrap does. Thus, the function and purpose of a nail wrap distinctly categorize it as a protective treatment for nails, making it the correct answer.