My next question, I shaved my head again today, this time in the shower. It was easier to do since I just shaved yesterday, and this time didn't have nearly as much hair. But there are some spots that I still feel stubble. No matter how many times I went over them. I can feel can feel stubble, but can't see anything. Could the blades be dull already? Yesterday was the first use, but I shaved from a buzzed head, not a bald head. How often do you guys change your blades? I guess it will be less now that I am bald. Thanks again!