I have black hair that's greying around the edges & lightly scattered grey thru the rest of my hair. I've been using my Laser Comb since December 21, & I'm starting to notice that there are spots on either side of my center part & other areas where the new growth seems to be growing in black. Is this a normal effect of the laser comb? So far I haven't had any shedding at all. Does everyone experience shedding or just some people? My nape area, which had thinned out & was very short, also seems to be filling in more & getting longer.