Olaplex No 0 Intensive Bond Building Hair Treatment is a primer for hair, designed to improve the absorption of following products, amplify their efficacy and achieve optimum reparative results. Formulated with highest dose of patented Olaplex technology, this lightweight formula works, as a primer to the No 3 to restore and repair chemical-treated, heat-ridden hair. Suitable for all hair types and textures it's especially beneficial to intensely damaged lengths; used frequently Olaplex No 0 Intensive Bond Building Hair Treatment promotes strong, healthy-looking results. Benefits: - Primes hair to intensify benefits of Olaplex No.3 Rebuilds broken and weakened bonds Repairs hair strands deeply Apply Olaplex No. 0 Intensive Bond Building Hair Treatment to dry hair. Saturate the hair from root to tip and leave it on for 10 minutes. Do not rinse. Next apply a generous amount of Olaplex No.3 Hair Perfector to saturated hair and leave it on for additional 10 minutes. Rinse, shampoo and condition the hair as usual. For best results use Olaplex No.4 Shampoo and Olaplex No.5 Conditioner. Water (Aqua/Eau), Bis-Aminopropyl Diglycol Dimaleate, Phenoxyethanol, Sodium Benzoate.