A frequently asked question is whether it is nessary to shave before treating an area with IPL. The answer is Yes. This is because you need to be sure that the head makes its way all the way down thru the hair into the follicle, and the longer the hair is the longer it takes to get the heat down into the follicle. So it is a good idea, but not absolutely necessary. It still will work if your hair is over 5mm, but it is wise to shave it close to the skin. The great thing is that once you see some re-growth from the first treatment, you can treat it as you see it growing back, so no more shaving is necessary if you stay on top of the re-growth.