Product Overview Ideal for damaged hair, the Nioxin Deep Repair Mask works to protect and strengthen the hair shaft against damage, reducing breakage right from the root. Containing Densiprotect technology to deeply condition coloured and dry hair, this lightweight hair mask also improves smoothness and makes hair more manageable. Directions for Use Use as needed after shampooing. Massage evenly through hair and leave for between 3 and 5 minutes. Rinse well.