The best tip is to avoid using your nails at all costs. For example, avoid opening soda cans with your nails and use a fork or pen instead. Use gloves wherever possible. When using your phone, use the pads of your fingers instead of your nails. You don’t want gunk underneath your nails. In this case, you can use your knuckles, the back of a makeup brush, or a spoon to scoop things out.