Concentrated nail serum with deep action. OPI Repair Mode: Patented technology to repair and strengthen damaged, splitting nails. In just 6 days, with application once in the morning and once in the evening on the natural nail, a 99% restoration of nail keratin is achieved, providing 94% protection against keratin protein damage and 4 times stronger nails due to the formation of new structural connections. The nails are repaired from within, not just strengthened on the surface like with conventional nail hardeners. Compatible with all OPI color lines and with Nail Envy. Vegan unisex formula: Repair Mode is absorbed by the nail. Invisible, transparent finish without a glossy layer.