I am almost embarrased to post this now that I have achieved "senior member" status, but maybe some of you will be saved the pain if you learn from my experience. Here is the tip: Never, never, put any part of the razor in your mouth! I was trying to get the corner under my mustache and thought, hey I can go at this angle, sure some of the razor is in my mouth but I will be very careful. Ouch. Bad idea. Do not try this at home.