This links to OECDs compilation of WHOs data, was easier to get the overview from imo: https://www.oecd-ilibrary.org/docserver/health_glance-2009-1...
Having lived in both the US and France, I can say that it’s been my experience that Americans have “nicer” looking teeth. Whether that translates into anything medically relevant is apparently really difficult to prove.
I’m sorry I didn’t dig any deeper than the link that was presented but it was about adolescent kids. And no one is saying that these differences show up in young people.
When I lived in Canada (which I assume isn't too different from the US) with poor social security due to my legal status, I never went to a dentist because it was far, far too expensive.