Hair mask for damaged hair Moroccanoil Strengthening hair mask is a revitalizing 5-7 minute treatment for damaged hair that requires immediate repair. It reconstructs the hair and provides the hair with proteins that have been lost due to chemical treatments or heat styling. Its highly effective, strengthening formula is rich in argan oil, shea butter and regenerating proteins that give the hair elasticity and strengthen it from the inside out. application /> After washing your hair, add a generous amount of Moroccanoil strengthening hair mask to the towel-dried hair and comb through well. Leave on for 5-7 minutes. Rinse well. This hair mask repairs the inner structure of the hair and should then be sealed with a conditioner. Use weekly first and less frequently once the hair is healthier again. Our tip for thick, coarse hair: Mix this product with a teaspoon of Moroccanoil treatment for more shine and elasticity.