In the '80s, a perm was supposed to leave your hair a Geena Davis-style froth of curls. But now that pin-straight hair like Gwyneth Paltrow's is the must-do do, the technology is catching up. The Japanese straight perm, a.k.a. "Japanese relaxer" or "super straight," makes hair hang straight for as long as six months and works on every type of hair except African. But if your calendar is full or your pockets aren't, it might be wiser to buy straightener in a box from the store: a Japanese straight perm can take up to eight hours in the salon and cost...
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