NIOXIN Deep Protect Density Mask is a professional density-protecting hair mask that leaves hair conditioned, manageable and smooth. It provides up to 97% reduction in hair breakage*, protects against damage and deeply conditions dry or coloured hair. It is suitable for all hair types, including curly hair. *vs non-conditioning shampoo. Nioxin is the N°1 Salon Brand for thicker and fuller looking hair with more than 35 years expertise in thinning hair.