Two dermatologists weigh in...
Even the basic mechanism by which crystal hair erasers work is unclear. "I've read and listened to a lot of advertisements about this and, I'm still dubious on the mechanism of action," says, MD, a board-certified dermatologist in Hamden, Connecticut. "Most claim that an etched crystalline surface makes the hair clump and fall off. When etched glass hits the skin, I think 'cutting' instead of 'clumping' is the more accurate verb.
In fact, Gohara thinks the mechanism is pretty much the same as a standard razor. "This surface cuts the hair down at the follicle opening.", MD, a board-certified dermatologist in New York City, is even more skeptical of their mechanism. "It is touted to use 'crystal nano technology,' whatever the heck that means, to physically clump hair and literally tear it at the skin's surface.
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