Olaplex Hair Perfector No.3 is a product that you can use in order to maintain the performance of your Olaplex treatment in the salon.Apply a generous amount of product to towel-dried hair. Comb through the hair and leave for at least 10 minutes. Then rinse out the product and then use the shampoo and conditioner. Olaplex Hair Perfector No.3 is not a deep conditioner to be left in the hair. The longer duration of action, the more power. Recommended use is once per week or as needed.