Do a good forum search- there are several threads on
vaping and dental health. A number of folks have bleeding gums in the beginning, though that's also sometimes a symptom of quitting smoking, so if you've recently stopped smoking, it's sort of hard to say. Most seem to say it goes away in a little while, though.
There are a few threads about
sore teeth too. Worth reading.
As far as your specific question, though, enamel? Can't think why there'd be any potential for damage- all the ingredients of e-juice are well known, and I can't think of anything in them that would damage enamel.
I suppose some of the darker juices might be able to stain teeth, but even that, I haven't heard of.
Best,
Ande