I'm a 4a/4b natural, and that's how I straighten my hair. I go to the dominicans and they blowdry the roots, or all of my hair afterwards. Starting this month though, I am not going to have the do any blowdrying at all, just the rollerset. I think it will turn out ok, except the roots just won't be as straight. But overall, I feel that rollersetting is one of the best ways for naturals to have straight/somewhat straight hair. I do not flat iron or press my hair at all, only rollerset and blowdry (which now, since I'm doing the bootcamp, I will stop the blowdrying). HTH