I'm curious - do you have a physical sensation when this happens to you? Is there any evidence to support this claim? I ask because I often feel similar to brushing my teeth when I meditate, it's hard to explain though.
On that: a buzzing sensation in your teeth? Yeah, I can relate. I think it's down to increased sensitivity to the nerves in your teeth that you normally don't pay attention to, but can be apparent when modifying your attention as in meditation. It could be something else, tho! :)
To your question on me: I feel this physically. This is not a 'claim', it's evidence: that I'm saying this to you.