I should have no teeth for more than one reason. Instead, I'm the same as you - no cavities even. I put it down as having grown up drinking water pumped out of a calcium aquifer that was right under a cow pasture. Lots of minerals of various kinds in that water, not to mention random microbes that have stimulated the impervious immune system. My wife and I don't eat a particularly American or British diet, either. I don't like sugar all that much, and we eat a whole lot of vegetables. Not much in the way of bread or pasta or anything like that, either. It's a CroMagnon diet by accident, except we generally cook animals before eating them.