The Sally Hansen Diamond Strength® Instant Nail Hardener helps save you from dry, brittle nails while leaving a beautiful natural finish. This high-powered nail hardener virtually ends up cracking, splitting and peeling, while locking in moisture so nails can grow. In just a single layer, it provides nails with reliable protection that's made to last. This treatment can make a helpful addition to a nail care routine with its quick-drying design.