Keep toenails dry and clean. This helps prevent bacteria from growing under your nails. Repeated or prolonged contact with water can contribute to split nails. Practice good nail hygiene. Use sharp manicure scissors or clippers. Trim your nails straight across and not down at the corners as this can lead to ingrowing toenails. Use moisturiser. When you use lotion, rub the lotion into your nails and cuticles. Apply a protective layer. Applying a nail hardener might help strengthen nails.