Hmmm, interesting. I was hoping it was a normal thing for a Heritage but maybe I need to get the front end checked out. Only have 2200 miles on it. FTR, I don't have false teeth.
Could be some wind buffetting. Your windshield may not be the right size for you. Try some different seating positions while riding. Also fold your left arm in front of your chest and move it around to see if blocking the air flow from under the windshield makes a difference. Wind deflectors can cure that problem.
If you're riding with the windshield, there's going to be some vibrations from the wind buffeting. Inoticed more when I had it cut 3". Doesn't bother me at all.
Start chewing gum when you ride, that might help a little.