Product Features It is a care product for all hair damaged or damaged due to dye, heat, sun and environmental factors. N°3 Hair Perfector, Olaplex's best product, visibly strengthens the hair by reducing hair breakage. It restores the healthy appearance and texture of the hair by repairing damage and protecting the hair structure. Increases the shine and vitality of hair. The safety and performance of Olaplex products have been extensively tested by independent third-party laboratories in accordance with in-group industry standards. How to Use - Apply a generous amount of product to damp hair - from roots to ends - Comb hair to distribute the product evenly and leave for at least 10 minutes. For intensive repair, you can wait longer. Then rinse and shampoo. Use once a week or 2-3 times a week for very damaged hair. As a two-part system, N° 0 Intensive Bond Building Hair Treatment can be used before N° 3 Hair Perfector.