Permanent hair removal has been available in some form for 125 years; the first electrolysis machine was invented in the late 1800s by an ophthalmologist who used the device to treat ingrown eyelashes (trichiasis). Since then, numerous electrolysis machines have been patented, but no new hair removal technology appeared until lasers entered the consumer market in the 1960s.
While electrolysis is undeniably effective, it can only target one hair at a time. The holy grail of permanent hair removal has always been the bulk treatment of many hair follicles at once. This reduces the time needed to treat an area of skin by a factor of several hundred.
The first lasers used in dermatology in the mid to late 1960s emitted a continuous wave, an impractical feature for View the rest of this article
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