Olaplex Intensive Bond Building Nº-0 155ML A professionally inspired treatment that prepares hair for deeper repair with the highest dose of patented OLAPLEX technology in any product to take home. It reconstructs the joints of the hair, strengthens and protects the integrity of the hair. Use it as the first step in a two-part system with N° 3 Hair Perfector. Scientifically proven: 68% more repair and 3 times stronger hair* * When used as a two-part system in one use. HOW TO USE The bottle No. 0 should last 3 to 6 applications, depending on the length and density of the hair.