Soft and splitting nails can be caused by various factors such as poor nail hydration, lack of proper care, or exposure to irritating products like harsh soaps or household cleaners. To combat this problem, you can try applying moisturizer to your nails and surrounding skin regularly, wearing gloves during household chores, avoiding harsh soaps, and maintaining your nails by trimming or filing them regularly before they split. If these measures do not work, you may consider purchasing a nail hardener from the cosmetics section.