Also, it depends on your hair color. The laser uses the pigment in your hair to travel to the root, where it basically bakes the folicle. The ideal candidate has dark hair, but light skin. I you have blond hair, don't waste you money, no matter what they tell you about the effectiveness, because you'll just end up getting countless treatments, with little, to no, results.

Oh, and they often shave you, because you can't have much of the hair showing. The reason is that the hair, long enough to lay on the skin, heated up by the laser, could actually burn your skin.