The characteristics of unmanageable, frizzy hair: Unmanageable, frizzy hair is hard to straighten and usually damaged because of it. With heat, external aggressions and humidity, frizz always comes back. The secret for a healthy straightening treatment: For the first time, L’Oreal Laboratories combined black cumin oil, legendary healthy nutrient and micro keratin known for being one of the most smoothing ingredient. Double action: Inside + outside the hair fiber: 1. Revitalizes intensely the hair fiber and makes it resistant to damage. 2. Smoothens fiber by fiber and polishes the hair surface from root to tip, for the most perfect straight. Proven results: Instantly, hair feels and looks like naturally straight, supple and shiny, full of life. Straight, hair up to 72h* with no frizz.