[zkms]

Looking into vitamin K2 (not K1) along with vitamin D is interesting as well -- I got my bone mineral density to 99th percentile (DEXA measured) without changes in physical activity (which has just been walking) with lots of K2 and vitamin D; with the vitamin D from sunlight and a UVB phototherapy lamp when I wasn't getting lots of sunlight. My sense is that bone and teeth health are at least significantly related and I bet having excellent bone density carries over to caries, or to a lack thereof.

My guess is that typical Western diets are pretty subpar in terms of vitamin K2 intake (modern Westerners aren't usually fans of liver etc) which makes teeth pretty vulnerable to physical/chemical insult.