"Mask treatment" refers to a skincare routine where a person applies a facial mask, which is a special cream or paste, on their face. This mask is left on for a specific amount of time to help improve the condition of the skin. Full definition
It's possible to make your own detox shampoos and hair mask treatments to strip your scalp of the built up chemicals and toxins and reveal it's naturally clean self. (bodydetoxtips4u.com)
Once in a while we all need a good mask treatment for your hair. (tlvbirdie.com)
I didn't use any other products in that time, just the Restore Shampoo & Conditioner 2 times a week, the Restore Mask Treatment once a week, and the Restore Instant Repair Lotion after every wash. (everydaystarlet.com)