Describe the proper technique for filing nails.

The correct technique for filing nails involves filing from the outer edge to the center in one direction. This method helps to prevent splitting and chipping of the nail, which can occur when filing back and forth. Filing in one direction allows for a smoother finish and helps to maintain the nail's strength. It is crucial for nail health to avoid vigorous side-to-side motions as they can weaken the nail plate over time.

Filing only the free edge could result in an uneven shape or length, leading to an unbalanced appearance. Filing nails while wet can also be detrimental, as wet nails are more prone to tearing and improper shaping. Therefore, using the proper technique with one directional filing from the edges towards the center is essential for achieving the best results and maintaining nail integrity.