Depending on how think your hair is, it can take a while. I had 12 sessions and then 2 more about a year later. I have no shadow or dark spots.
the hair on myhead is mostly white/grey so it won't work for me. But if it did work, I would do it. My hair has gotten so thin and whispy that growing hair is no longer a realistic choice. So, then I would rather it be completely gone because I don't like shaving myself.I so get my scalp lasered several times a year anyway to remove pre-cancerous spots. The pain really isn't all THAT bad.
Chris, if you only have that little bit left, would it be worth it? It's a pain in the butt for us BBC guys that have an entire head to keep smooth! And I have to shave everyday because I like it completely smooth.