Quantum Keratin Smoothing Treatment is a revolutionary, 2-step system that gently smoothes hair from the inside out. In just 90-minutes, hair is transformed with exceptional smoothness, incredible softness and luminescent shine. The patent-pending Leave-In Keratin Concentrate replenishes vital keratin deep within the hair shaft, which dramatically improves styling and manageability and helps prevent future damage. Curl gradually returns allowing regrowth to blend seamlessly into treated hair.