The Cezanne Perfect Finish Keratin Smoothing Treatment is a transformational, long-lasting and safe salon treatment that brings hair to its ideal, most beautiful condition without damaging or dangerous chemicals like formaldehyde, which can be found in other straightening or smoothing products. Cezanne is the answer:For the stylist who wants to join the top beauty professionals in the world delivering an amazing result to the client without exposure to the health dangers of excessive formaldehyde usage. For the client who wants a long-lasting treatment that delivers straighter, smoother, frizz free hair without damaging or dangerous chemicals like formaldehyde--often found in other straightening or smoothing products.