Teeth tingles from time to time that's about it
Oh yeah, that reminds me. Apparently, as the blood flow in your mouth improves, you can (not "will", not everybody) experience tooth pain. Or some problem with your teeth that was developing anyway will emerge and be a pain in... well, jaw?
It's not caused "by vaping" per se but by "not having poison gasses in your mouth". I had an old, old root canal thing act up at times and, once in a while, make me think I was going to have to crawl to the dentist. Then it stopped. And hasn't come back.
A lot of the "side effects" seem to actually be "your body recovering". It often can be a good thing that's just not pleasant. Like the cough a lot of ex-smokers (vapers or otherwise) can get. Lots of disgusting stuff starts coming up. But it's because your lungs are cleaning house. Which is positive if... icky?