This is largely dependent on the individual and the area of hair removal. The majority of people require four sessions to eliminate the most hair in the chosen area. However, some people may require up to ten sessions for more troublesome areas.   IPL only works on active follicles as the treatment targets hair follicles. As a result, more hair follicles tend to emerge at a later date, making it unlikely to become completely hair-free.   However, it is common for treatment recipients to have 90 percent less hair, with any remaining hair returning at a slower rate.