Great repair calls for great prep. Taking inspiration from professional treatments, Olaplex's No. 0 is a primer for No. 3 which ensures maximum nourishment absorption for deeper repair. Boasting the highest concentration of the patented Olaplex technology in any take-home formula from the brand, the No. 0 Intensive Bond Building Treatment magnifies the performance of the No. 3 Hair Perfector, helping rebuild bonds, boost overall strength and protect hair integrity.Scientifically Proven Results: 68% more repair and 3x stronger hair*.This bottle should last about 3-6 applications depending on hair length and density.Suitable for all hair types; ideal for those with visible hair damage.pH-balanced. Vegan-friendly. Cruelty-free. Does not contain phthalates, parabens, sulfates, gluten, phosphate or nuts.OLAPLEX products are thoroughly tested in accordance with industry standards in-house and by independent third-party laboratories for safety and efficacyGeneral Info: Turn dry, brittle hair into superbly shiny, silky soft locks with OlaplexHow to apply:Apply this treatment to clean, dry hair from roots to ends and comb through with a wide-tooth comb or wet brush to ensure saturation.Leave for 10 minutes, then apply No.3 Hair Perfector directly on top of No. 0 and comb again to saturate thoroughly.Allow the treatment to sit for another 10 minutes or longer.Once this is done, rinse and wash with Olaplex No. 4 Shampoo and No. 5 ConditionerIngredients:Water (Aqua) Bis-Aminopropyl Diglycol Dimaleate Sodium Benzoate PhenoxyethanolIdeal for: Priming hair to absorb nourishment for maximum repair