L’Oréal Professionnel Serie Expert Pro Longer, 500 ml, Hair Masks for Women, The L’Oréal Professionnel Serie Expert Pro Longer hair mask is an essential step in your hair care ritual. Give it a moment to regenerate and it will repay you with vitality and beauty. Characteristics: makes it easy to comb through and prevents damage restores hair structure goes deep into the hair fibre helps stimulate hair growth takes care of the lengths of weakened hair How to use: Wash with shampoo, then apply to damp hair. Leave to act as instructed on the packaging, then rinse thoroughly.