Brand new and sealed! A pre-shampoo hair treatment that reduces breakage and split ends for visibly healthier hair. OLAPLEX Bond Building Technology™ is proven to relink broken disulfide bonds damaged by chemical services, heat, and styling. This deeply reparative, at-home bond-building treatment for damaged hair is formulated with patented OLAPLEX Bond Building Technology™. It helps to rebuild weak and broken disulfide bonds for visibly healthier, stronger hair and to reduce breakage and split ends.