How can improper filing technique damage the nail?

Improper filing technique can indeed result in splitting, peeling, or weakening of the nail. This is primarily due to the fact that filing with too much pressure, in the wrong direction, or using a file that is too coarse can create microtears in the nail's structure. When nails are filed incorrectly, the layers of the nail can become damaged, leading to separation and a tendency for the nail to break or peel away. It's important to use a gentle touch and file in a consistent, smooth manner to maintain the integrity of the nail plate.

The other options suggest that improper filing can enhance nail strength or that it causes no damage at all, both of which do not reflect the reality of what can happen. Additionally, while improper filing techniques may potentially affect artificial nails, those outcomes are not as directly related to the natural properties of the nail as the risk of splitting and weakening.