Another good way to straighten your hair after washing it is to put in whatever products you use as a leave-in or oil, put your hair in 2 ponytails (Pippy Longstocking), braid or twist the ends, and let it air-dry (Thanks, armyqt!) Your hair will have more bounce, shine and be more manageable. You could probably get away w/ flat-ironing it only once and it will last until you wash again. It's worked for me so far. I MAY flat-iron my hair every 4-months or so, otherwise, I wear a braid-out every day.