Olaplex No.0 Intensive Bond Building Treatment is a professional-inspired hair treatment that primes hair for deeper repair. This 155ml treatment contains the highest concentration of Olaplex's patented bond-building technology, designed to repair, strengthen and protect all hair types. Key features: • Professional-grade bond building formula • Repairs and strengthens damaged hair • Works on all hair types • Primes hair for enhanced treatment results • Contains patented bond-building technology • 155ml/5.2 fl oz size For best results, apply to dry hair and saturate evenly from roots to ends until hair is damp but not soaking wet. Leave on for 10 minutes, then follow with Olaplex No.3 Hair Perfector (sold separately) for maximum repair benefits. This intensive treatment helps rebuild broken hair bonds and can be used as a standalone treatment or as part of the complete Olaplex system. The formula is free from parabens, sulfates, and phthalates.