Experts recommend that after straightening or intensive keratin treatments, nourishing, salt-free shampoos and conditioners be used. Salt can reverse the effects of the treatment, causing frizz and allowing the hair’s natural curl to return. Firenze’s Keratin Line is formulated with antioxidant agents, a hydrolyzed vegetable protein complex, and keratin extract that restore the hair fiber, leaving hair shinier, healthier, and completely frizz-free.