A concentrated treatment that strengthens the hair from within, reducing breakage and improving its look and feel. Nº.3 Hair Perfector is not a conditioner, it’s an at-home treatment that contains the same active ingredient found in all professional Olaplex products. Created by two of the top PhD's in chemistry and materials science, Olaplex products feature first-of-their-kind, patented, bond-building technology, which relinks the broken disulfide bonds caused by chemical, thermal, and mechanical damage to the hair. This formula is made to work with every hair type, providing real, structural repair that works from within. Features & Benefits: Addresses damaged and compromised hair Strengthens and protects hair structure Restores healthy appearance and texture Apply a generous amount to towel-dried hair and comb through. Leave on for a minimum of 10 minutes. Keep in mind, the longer it's on, the more effective it is. Rinse, shampoo and condition.