Which of the following is likely to affect nail health?

The choice that highlights the impact on nail health due to incorrect filing techniques points to a crucial component in nail care. Incorrect filing techniques can lead to a variety of problems with the nails, such as splitting, peeling, and breakage. When nails are filed improperly, it can create weak points, increasing the risk of damage. This can result in nails that are not only unattractive but also more susceptible to infections and other issues.

In contrast, regular hydration and a balanced diet are actually beneficial for nail health, promoting strength and resilience. Frequent nail polish application, if done with proper techniques and appropriate products, does not directly harm nails but could contribute to issues if not accompanied by proper care and nail health practices. Thus, understanding the significance of correct filing methods is essential for maintaining the health and appearance of nails.