There are three stages of hair growth. The catagen, anagen and telegen stages. Only the telegen stage is what can be removed . The 1st treatment may remove 30 % . That's why you may need it 5 times to keep up with new growth. The process isn't a quick fix. Hair removal is a process. At any given time, you have hairs that are at different stages. So as the new growth appears- keep doing the laser , all hair will be destroyed . The calibration can be set higher each time. The 1st time is set conservatively so you don't get burned.
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