Why should you avoid filing nails back and forth?

Avoiding the practice of filing nails back and forth is crucial because it can lead to splitting and damage to the nail. When filing in a back-and-forth motion, the natural layers of the nail plate can be stressed. Nails are composed of layers of keratin, and this agitation can cause these layers to separate, resulting in splits or tears. This not only weakens the nail but can also lead to discomfort or even potential infections if the nail becomes damaged enough to expose the underlying skin.

Instead, filing should be done in a single direction, which allows for smoother and healthier shaping of the nail without causing undue stress to the structure of the nail.