The Four Step Hair and Scalp Facial Treatment with Philip B Rejuvenating Oil should be performed on extremely dehydrated and/or damaged hair twice a week, on dry hair weekly, and on normal hair one to four times per month. For both dehydrated scalp and hair, one to two times per week. This Four Step Hair and Scalp Facial Treatment is highly beneficial one to two days before applying color. The Four Step Hair and Scalp Facial Treatment evens out hair"s porosity; clarifies and conditions so that the color deposits evenly with more shine and longevity.