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Dr. Mike O'Neil is the Director of Research for Tria. Let me show you how the Tria Laser works. Hair shafts, which we can see, are typically colored with melanin, which is dark, and they're present in hair follicles which we can't see, they're invisible. But it's the follicle that we're interested in. The Tria Laser emits light at 808 nanometers, which is absorbed strongly by the melanin in that hair. It heats up the hair. That heat transfers to the follicle and inhibits it, preventing further hair shafts from growing in that same follicle. So the result is hair-free, smooth skin.
Hair Removal Laser - How It Works