Quite a few years ago, I had my hair straightened. What had happened was that I had gotten a perm, something I had done a million times since I was a preteen. Well this last perm, I really did not care for. So, I went into the salon and asked to have it straightened. I believe what they used was pretty much like the perm solution. However, instead of using curling rods, they combed it straight, and I had to sit there super still, for like 30 minutes or so. It worked great. However, like a perm, it only lasted a few months. By this time, the original perm was gone too, though, so it worked out for me. Naturally, my hair is somewhat straight, with some mild waves to it. I have pretty thick course hair, so I could do lots of stuff to it, with minimal damage. You'd never know all the stuff I've put my poor mop through! With naturally curly hair, my guess is that you would have to have it done every few months or so, like people that get regular perms. If your hair is super coarse, and/or thick, it may take something stronger. I agree with Dar- what ever you choose to do, do a moisturizer, periodically. Flat irons, perms, relaxers, all that stuff really takes its toll. Good luck!