Olaplex No 3 Hair Perfector at home treatment helps strengthen, soften, control frizz and add shine to hair. Olaplex No 3 Hair Perfector is free of silicones, oils, parabens and gluten. Apply a generous amount to towel-dried hair, comb through and leave on for a minimum of 10 minutes or longer, then rinse, shampoo and condition. This is NOT a conditioning treatment to be left on the hair. The longer this is left on, the more effective it will be. This may be used more than once a week if necessary.