Actually, I do think we have less, in a weird way. But more importantly, they have semi-socialized medicine. The Government dictates what something costs. Just look at the rates in France..
Generalist consultation 23 € 70% 6,60 €
Specialist consultation 25 € 70% 7,50 €
Root canal 93,99 € 70% 28,20 €
I don't know about you, but I don't think there WOULD be any dentists in the US if they could only get 128 bucks for a root canal. Or 31 bucks for an office visit. Hell, I think Obamacare co-pays are almost that much.
As for an objective mathematical way, I am sure someone can and will come up with it. But hell, everyone in the world knows we are the most unhealthy people on the planet.