why is it that laser hair removal works for some people but for others, it grows back?

Question by Gina S: why is it that laser hair removal works for some people but for others, it grows back?
i'm a mtf transsexual, and am looking to get laser hair removal done, but i heard some people say it doesn't really work. i also don't want to do electrolysis because that takes hours and

Hair Removal How...