Yes, we recommend that you shave the desired areas between treatments and before using your handset. Shaving takes the hair down to the appropriate length whereas not to cause any burns during treatment but also allowing the hair root to get targeted effectively. Other forms of hair removal including waxing and tweezing will remove the hair root entirely. Which won't allow the IPL to target the root. That being said if you run your hand over the area and cannot feel any hair at all, then there is no need to shave. In regards to peach fuzz on the face, we recommend derma planning to remove those hairs prior to treatment.Our IPL handset works by emitting a wavelength which targets pigment in the hair. As the light is absorbed by the pigment in the hair it turns to heat which then kills the hair growth cells. Hair will grow back more sparse and slower after each treatment, reducing hair growth permanently overtime.