Our Straight, Smooth, Strong & Long Treatment is available in our 30-day Starter Kit which includes this and our other ancillary products for your convenience. Click here to order our 30-day Starter Kit.Liquid Keratin Filling Leave-In Conditioner bonds keratin proteins and vitamins to hair follicles to fully condition hair inside and out providing long lasting moisture, strength, shine and manageability. Lightweight formula protects from sun damage while keeping even frizzy hair smooth and soft.All Liquid Keratin aftercare products help prolong and improve the results of Liquid Keratin 30-day Straight Smooth Strong & Long Treatment. All aftercare products are paraben and sodium chloride free.