I have used several brands of Brazilian smoothing before ordering it. I am delighted to have finally found a product that meets my expectations. It smoothes my hair without damaged. Attention however to the original color of your hair that will evolve depending on the pose. My hair has the tendency to pull the orange after a treatment like this so I'm obliged to then make a color (a few days). I use much more keratin indicated, my hair is porous and frizzy. I am delighted that I can after so many trials with other products let my hair free and without bushning. they are shiny and soft. For information using smoothing my hair is not brittle and they are present long (almost middle back)