It takes about six to eight sessions at four to eight week intervals. The laser only responds to hairs currently growing, and hairs grow on different cycles, so not all are caught in one pass. Regrowth visibly drops from the third to fifth session, and the area is large, so each session takes time.

Hair becomes finer and regrowth drops greatly, but it is not completely permanent. Even with the root structure damaged, some survive and become active again over time. The legs cover a wide area and regrowth differs by zone, so after finishing the course many people top up only the zones that responded least.

It stings about as much as a snapped rubber band, and cooling runs alongside, so it is tolerable. On the legs, areas close to bone such as the front of the shin feel a little more sensitive. Waxing or plucking beforehand pulls the root out and reduces the effect, so come having only shaved.