I like this nail polish treatment. I am not sure if it has hardens my nail, but it definitely adds the lasting shine. This polish leaves your nails super shiny, as if they were freshly waxed hardwood floors. Awesome! Another positive about this polish is that it dries quickly. This is great for busy people. I do wear this polish to prevent my nails from breaking so that it can grow longer. I can say that my nails have grown quite a bit, but it still cracks sometime.