What does the filing technique in nail care involve?

The filing technique in nail care primarily focuses on shaping the edges of the nails, allowing for a smooth and controlled finish. Proper filing is essential because it not only defines the shape of the nail but also helps in preventing any snagging or breaking. Techniques like filing in one direction rather than a back-and-forth motion are important to maintain the integrity of the nail and avoid damage.

While the other options refer to different aspects of nail care, they do not directly relate to the filing technique. Removing nail polish efficiently, enhancing color through painting, and applying chemical treatments for strengthening are all important practices in nail care, but they do not specifically describe the process of shaping and smoothing the edges of the nails that is fundamental to effective filing.