The only thing that I know is that I have had the Coppola Keratin Treatment done twice before, and I loved it!! It made my hair almost straight - but still wavy, and I was able to let it air-dry most of the time.

One downside - mine washed out in 2 months even though they said it would last for 3 months. But, I wash my hair everyday, so I'm sure that shortened the length of time.

I paid $300 for mine.
Hair Type - wavy/curly, fine texture, thin/medium density