Final answer:
The splitting of the nail may be caused by filing too aggressively or in the wrong direction, weakening the structure of the nail. Filing gently and in one direction, using a fine-grit file, and keeping the nails moisturized can help prevent splitting.
Step-by-step explanation:
The splitting of the nail may be caused by filing. When you file your nails too aggressively or in the wrong direction, it can weaken the structure of the nail and cause it to split. The nail plate, which is the visible part of the nail, can become damaged and may start to split as a result.
It's important to file your nails gently and in one direction to prevent splitting. Using a fine-grit file and avoiding excessive force can help maintain the strength and integrity of the nails. Additionally, keeping the nails moisturized and avoiding harsh chemicals can also help prevent splitting.