No. 3 Hair Perfector is a concentrated treatment that strengthens the hair fro within, reducing breakage and improving its look and feel. It is not a conditioner, itâ€™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. Key benefits: Addresses damaged and compromised hair, strengthens and protects hair structure, restores healthy appearance and texture. HOW TO USE: 1. Use once a week or two to three times a week for damaged hair. 2. Apply on damp, towel-dried hair. 3. Apply a generous amount from scalp to ends until hair is thoroughly saturated. Leave on for a minimum of 10 minutes (longer if desired). 4. Rinse from hair. Shampoo and condition as usual.