Well, the skin didn't come back either. When the x-ray destroyed the hair it also destroyed the surrounding skin. After a few months of x-ray treatments some people ended up looking like Swamp Thing. I give them credit for trying to perfect their devices. To congratulate them on having accomplished this would be premature.
Lasers emit intense heat at close range.
There are several different types of laser devices now in use. I still have not heard of any that are safe and actually effective as far as permanent hair removal. In fact, the Food and Drug Administration does not allow the manufacturers of these devices to advertise permanent results . There is not only a strong possibility for skin damage, but harm to internal organs in the body could result from such high-powered and intense laser radiation.