[QUOTE=StarvingButStrong]
In societies where women (usually) grind grain between two stone surfaces, you end up with a bit of stone grit ‘contamination’ in the result. You’ve got to think that biting down on even a small amount of stone dust will do damage to your teeth as the years go by.
[/QUOTE]
As I understand, the teeth of ancient Egyptians show the worst of this “grit-wear” because of sand which is not only created when flour is stone-ground, but from tiny particles which blows into food when it’s prepared out in the open or in homes without window screens.
You see a lot of wear on the teeth of ancient Native American women, not only from stone-ground grains but from the pratice of chewing hides to help soften them.