Perfect Blow Dry is suitable for all hair textures. Whether your hair is straight, wavy or curly, the blow dry treatment delivers long-lasting smoothness and shine.When used as a system with the Smooth Infusion Anti-Frizz Shampoo and Conditioner, the spray effectively shields hair from humidity for up to 72 hours. Since the treatment is heat-activated, it should be applied before blow-drying, straightening or curling for best results.