Olaplex No.3 Hair Perfector - 100ml For all hair types, especially for those with visible damage. Olaplex No.3 Hair Perfector is a weekly at-home treatment, not a conditioner, that reduces breakage and visibly strengthens hair, improving its look and feel. PH Balance: 3.5-5 Free of DEA, Aldehydes and Formaldehyde Use Dampen hair and apply from roots to ends. Use once a week or two to three times a week for damaged hair. Pro Tip: Prime your hair for deeper repair with our professional-inspired No.0 Intensive Bond Building Hair Treatment (sold separately). Use No.0 as the first step in a two-part at-home system with No.3 Hair Perfector to strengthen and repair all types of damaged hair.