I ve had occasional left lower lip numbness for a few months now, had two upper front teeth removed and dentures put in bout 8-9 months ago, numbness is like a shot of Novocain, and has only recently started about 2 months ago or so, and its only occasional. Headache as well, but have always had regular headache s, by regular I mean fairly often, but not very intense, and numbness only last a short time, usually within the same day it starts it goes away.