Why does he like to lick my teeth?

So my question here for guys

I was with a guy for almost 5 years

One day while we were kissing and making out he asked me if he can lick my teeth which I found really weird back in the days but it passed... A year later I was with another guy totally different guy and he asked for the same thing

So what's the deal here 🙂🙂

Does it happen quiet often or is it weird?

Why does he like to lick my teeth?
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