Between my husband and myself, we spend about $1500 a year for preventive dentistry but it is less than and amortizes what periodontal surgery, crowns, root canals and implant therapy would cost if we were neglectful-
I figure that if you do that for 30 years (low estimate) that runs up to $45 000.00. Add in your daughters prices, for let's say 15 years and that's $60 000.00 in total.
Holy moly. That staggers my imagination even more. You can read that (estimated) number several ways. A first is to think that people in the US must have money to burn if they can spend such enormous amounts out of pocket for simple dental prevention - not real work, but just out of caution. Another way to look at it, is to compare it to dental costs in other countries and calculate the difference.
Now I know that not all EU countries include dental care in their national health insurance schemes, Belgium for instance does, Spain does not, these I am certain of. Others I can't comment on. But still, what prices you quote ...
And to comment on cars (since you brought it up): my last one lasted 24 years and I it lost because it was stolen. Not because it broke down. In fact, ever since not taking it in for maintenance at the dealers anymore because of their exaggerated prices, it never ran so good and never broke down. Maybe beside the point, but my experience with preventive maintenance is that you're often better off without it. At least for cars ... ha ha