Orly Nail Defense Nail Strengthener Treatment - 0.6oz Nail Hardener for Weak & Brittle Nails - Formaldehyde-Free Nail Care Solution - Perfect for Salon & Home Manicures

Haven't used this product long enough to know whether it improves nails completely. So far, it's excellent. Very easy to apply, covers ridges, leaves a nice shiny coat.A friend loaned me hers and I loved it so much I had to purchase her a new bottle.I had weak nails and started using it and now they are a lot stronger, wonderful product.