This smoothing system infuses Keratin deep into the hair cuticle, eliminating up to 95% of frizz and curl and leaving the hair smooth, shiny and luxurious. Results typically last 3 to 5 months depending on hair type. Unlike other salon services, the more you treat the hair, the healthier it becomes. With each treatment, the build-up of Keratin makes the hair, smoother and silkier, straighter and shinier, easier and faster to blow-dry and closer to being "maintenance-free". Keratin Complex Smoothing Therapy is gentle enough to use on ALL hair types: color treated, chemically procesed, bleached or highlighted.