Rusk Pure Mix Activated Charcoal Purifying Mask All Hair Types is a regulating hair treatment that helps to eliminate excess oils and dirt from your hair. Leaves hair healthy every time. Will not cause dryness or dullness. When caring for your hair or creating a daily hair care routine, it is always important to keep certain things in mind. Wash hair less often. Over washing can cause dryness, dullness, irritate scalp and breakage. Use gentle shampoos that are sulfate free or that use mild sulfates. Unless you have oily hair, which sometimes requires a deeper cleansing. Use a daily hair conditioner and weekly hair mask to treat any special area of concern with your hair such as dryness, breakage, color protection, volumizing.