This professional-inspired treatment primes your hair for deeper repair, rebuilds hair bonds, strengthens, and protects hair integrity. Use as the first step in a two-part at-home system with No.3 Hair Perfector (sold separately) to strengthen and repair all types of damaged hair. Redesigned for a quick and targeted stream application, the No.0 Intensive Bond Building Hair Treatment features an easy-to-use nozzle that primes the hair and delivers the highest concentration of the patented bond-building technology of any Olaplex at home product. Scientifically Proven: 68% more repair and 3x stronger hair* *When used as a two-part system in just one use. - Primes hair to intensify benefits of No.3. - Jump starts repair deep within the hair strand. PRO TIP: Brush or detangle hair before applying No.0 so it can easily be absorbed. For thick, coarse, or long hair, work in small sections to ensure each area is fully saturated. To use: Apply slowly to dry hair, distributing evenly from root to