It stimulates the cells around the hair follicles to restart, it’s like rebooting your computer, in fact it will send the signal to your hair follicle to start producing hair. These laser lights do increase the vascular network in the area of your scalp. You end up stimulating cells to create hair. The drawback with the illumiWave and the Bella Contour, is that you have to keep doing it. However, you don't have to do it as often as time goes by. Once you reach where you want to be, maintenance is the order of the day.