Use the System Professional Smoothen Mask for rebellious, coarse and unruly hair that needs an anti-frizz effect. Ideal for curly hair that needs control and hair that is difficult to style. A luxurious weekly treatment for intensive hair texture control and softness. The Smoothen Mask will reduce fly-aways, calm frizz and keep the hair structure smoother for longer. With EnergyCode™ for responsive hair full of energy.