Olaplex No.0 is a professionally-inspired treatment that primes hair for deeper repair with the highest dose of patented Olaplex technology in any product designed to be used at home. Olaplex No.0 rebuilds hair bonds, strengthens, and protects the integrity of your hair. Use as the first step in a two part system with Olaplex No.3 Hair Perfector. Great for all hair types and repairing hair damage, this No.0 is for Olaplex curly hair, wavy hair or straight hair.