Big fan of Opi...the Nail Envy for Dry and Brittle nails is Simply the Best for me. Wore Acrylic nails for 16 years and went natural almost 3 years ago. I used several other products during the renewel of my natural nails. All the buffing and filing did damage and it took about 6 months to grow out the ridges from the fills and drills with the Acrylic's. Could not be happier that I took the product off and have perfect sport length nails. The Opi for Dry and Brittle nails is something I still use till this day. It lasts about a week. Two coats and then an Opi Top Coat, they look clean shiney and classy.