Ok, a stylist told me this, and I believe her. She actually did it to my hair. Have you heard of Biosilk
Silk Therapy? It is really good for your hair and makes it very smooth and silky. If you put this into you hair(and I do mean QUITE a lot) and then use a flat iron on it, it will basically "cook" the silk therapy into your hair and smooth it. Do not be alarmed, as the product will actually smoke. (again, I have had this done by a professional and done it myself, and my hair is just fine) Obviously, this is like ironing, you do not want to leave the flat iron in one place for long, just enough to set the product to work, while smoothing your hair. I promise, it may seem messy or greasy at first, but if you get the hang of it, your hair will end up soft and smooth, like model's hair. You could probably do the same thing with a curling iron, as well, if you want to have curls. The great thing is that this creates a barrier and conditions your hair while it is styled. Then if you can go a few days between washes, it will help keep your hair in the best condition it can be in.