Yes, but what kind? There's a great deal of leeway in who is allowed to call themselves a "doctor" and of course it varies by country. My joke was based on the fact that it's quite common for people to consider medical doctors to be the only "real" doctors and dentists usually only have dental degrees instead of the longer medical degrees obtained by these "real" doctors. It's a bit like making fun of PE teachers by saying they aren't real teachers. Not a very good joke and pretty niche. Not sure why I broke it out.
Moving on.
I've never really understood where the myth about British teeth comes from. We have the best teeth in the world. That's a verifiable fact.