What is the purpose of filing the free edge of the nail?

Filing the free edge of the nail serves the important function of creating a smooth finish and preventing potential snags. When the free edge is filed properly, it helps to eliminate any rough or uneven edges that may catch on clothing, hair, or other objects, thus reducing the risk of breakage or discomfort. Additionally, a smooth free edge contributes to the overall aesthetic appearance of the nails, enhancing their polish application and making the nails look well-groomed.

While some options may seem relevant, they do not directly relate to the primary purpose of filing the free edge. For example, removing excess polish is not the main goal of filing; rather, that is typically accomplished through different techniques or tools. Similarly, while filing can indirectly impact the nail structure, it is more about the cosmetic and functional benefits rather than the actual strengthening of the nail. The improvement of growth rate is not influenced by filing the free edge, as nail growth is primarily determined by factors such as health and genetics. Thus, the correct option focuses on the crucial role of filing in enhancing the nail's usability and visuals.