Sally Hansen Diamond Strength® Nail Hardener is engineered to stop nails from breaking. Its specialized formula, containing real Micro-Diamonds and Titanium, instantly bonds to the nail surface. This process strengthens nails, virtually eliminating breaking, peeling, and tearing. Ideal for when nails require extra protection, it leaves them noticeably harder and more resilient. For best results, apply one coat to bare nails; it can be used on its own or as a strengthening base coat before applying polish.