For professional use only, read all instructions & warnings prior to buying and using the GKhair The Best. GKhair The Best instantly smooths, straightens, repairs, strengthens & conditions the hair using anti-aging keratin that restores the life by repairing the hair from the inside out. An Express Formula that that smooths, straightens & strengthens your hair for longer period of time. It Increases the hair's durability to heat, breakage and chemical damages. GKhair The Best doesn't contain any substances that can damage your hair. Not only this keratin treatment is paraben free, it is also sulphate free and Salt free. Smooth and straighten your hair easily with the formaldehyde free formulation. Choose to smooth effectively and safely on all hair types. Great for men and women looking to reduce frizz and soften curls.