Olaplex® No.3 Hair Perfector 100mlWhich hair type is it good for? Straight Wavy Curly Coiled Tightly Coiled What it is: A concentrated treatment that strengthens the hair from within, reducing breakage and improving its look and feel. Suggested Usage: Use once a week or two to three times a week for damaged hair. Apply on damp, towel dried hair. Apply a generous amount from scalp to ends until hair is thoroughly saturated. Leave on for a minimum of 10 minutes (longer if desired).