1. Keep them out of the water br When cleaning the dishes or even swimming, the water softens the nail and make it more breakable. br 2. File them right br First start by clipping. Then file your nails using a fine-grit cushion, not metal. Always file in one direction, it's the key to healthy nails. br 3. Take Biotin (vitamin B8 or B7) supplements br It's the only vitamin proven by scientists to strengthen nails and hair. br 4. Five days on, five days off rule br Take a break from nail polish, gel or acrylic. Five days on, five days off. Your nails will thank you. br 5. At-home nail treatments br Make your own nail treatment regularly. For yellow nails, mix lemon juice and baking soda. Rub on nails. For dry nails, dip the nails in olive oil. br 6. Visit the dermatologist br If your nails are still brittle, visit your dermatologist. He'll find other products and solutions.