I hope I can provide some insight to this situation you are experiencing. For me, my hair has gotten to such a state that it looks almost the same with or without a flat iron just by using a blow-dryer. (I haven't really air-dried my hair in about 1 year or 1.5 years.) The reason for this is like HijabiFlygirl said, health and heat. My blow-drier is 1875 watts I put the settings on high with turbo combined. Even though this did help more compared to other blow-driers, my hair would still come out looking like a poodle. This is where health comes in; even though I don't believe your hair can be all that healthy once it's damaged because hair is dead once it grows out of the scalp, you CAN maintain it and preserve it. What helped me do that was a combination of intense conditioning, keeping my scalp clean, stretching my relaxers (my hair dresser overlaps, especially if I don't stretch), and eliminating the use of heavy products on my hair. Heavy products always made my hair limp and/or stiff and intense conditioning with a protein and moisture kept in mind definitely helped. Even though I don't flat iron anymore, if you take the advice given that you will receive throughout this thread you should see results and your hair should be VERY sleek.