Joanna Rebuilding Rebuilding mask with keratin 500 ml. Intensively rebuilding mask with keratin for weakened, rough and brittle hair. Active keratin contained in the mask penetrates deep into the hair, regenerating it and closing the scales. The mask intensively strengthens and smoothes the hair. It restores their strength, glow and vitality. Leaves hair nice to the touch. Ideal for hair weakened by styling treatments, brittle, rough and difficult to comb.