Multiple treatments (typically 6-8 spaced 8-12 weeks apart) depending on the type of hair and skin color have been shown to provide long-term reduction of hair. Current parameters suggest a series of treatments spaced at 8-12 weeks apart for based on typical hair cycle patterns for each area.[11]
The number of sessions depends on various parameters, including the area of the body treated, skin color, coarseness of hair, reason for hirsutism, and sex. Coarse dark hair on light skin is easiest to treat. Hair on darker skin is harder to treat. Finer hair is only sometimes affected. Certain areas (notably men's faces) may require considerably more treatments to achieve desired results. In addition, since hair grows in several phases (anagen, telogen, catagen) and laser can only affect the currently active growing follicles (anagen), several sessions are needed to kill hair in all phases of growth.
It's important to note that laser does not work well on light-colored hair and most fine and vellus hair ("peachfuzz") of any color
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