The most effective long-term removal methods today are the laser and IPLs (intense pulsed light systems, somewhat similar to lasers).
Although a lot of machines are being advertised as lasers, don't fall into the trap and believe every laser hair removal advertisement you see. The most effective systems currently existing are Diode, NdYAG and IPL/VPL.
In these techniques, the hair is first shaved off, leaving the roots intact and a laser probe is then passed over the area, 'shooting' each square centimetre of skin sequentially, till the whole area is covered. The laser energy is of a particular wavelength and is selectively absorbed by hair roots, thus destroying them and causing minimal or no damage to the surrounding skin.
Thus, the thicker the hair (like underarms or sideburns), the more laser energy it absorbs and the more effectively it gets destroyed. Dormant or 'sleeping' hair follicles are missed by the laser and they grow back, necessitating repeated sessions, but you can expect to be hair-free for a few months between sittings. At the end of your sessions, the number and thickness of hair growing back is permanently decreased. You can technically never reach the '0 hair' target, a few sessions can make your hair so fine, light and sparse that your skin looks cosmetically flawless.
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