Dry hair can cause more frizz, so keeping your hair healthy and hydrated is a must for anyone looking for smoother, shinier hair. TRESemmé Keratin Smooth Deep Smoothing Mask is a deeply nourishing hair treatment specially formulated to moisturise hair while helping to control frizz for up to 72 hours. This keratin smooth mask has five smoothing benefits into one: fights frizz, detangles knots, boosts shine, adds softness and tames fly-always.