Meet the first ever bond building nail serum with Patented Ulti-Plex Technology™ that penetrates the nail surface to build new bonds from within! OPI Repair Mode Bond Building Serum reprograms your nails, resulting in 99% nail keratin repair. Improved looks after just one application, expect smoother, stronger nails resistant to breakage and an improved appearance of ridges and color. Prevent nail damage from things like hand washing or cleaning products to keep your color perfect, longer!