Replenish and restore damaged hair with the Olaplex No. 0 Bond Builder. The bond-building hair treatment is designed to improve the absorption of subsequent products and achieve optimum reparative results. Infused with the highest possible concentration of Olaplex technology, the lightweight formula works as a primer for the No. 3 Hair Perfector, helping to rebuild bonds and strengthen damaged hair. Add this breakage treatment to your haircare routine to promote strong, healthy-looking results.