Semi-related: When I was in the canyons of New Mexico learning about various tribes and their lifestyles, I learned that many died from tooth-related infections. This is because the mortars they used were made from softer stone that crumbled in the grinding process (when they grind maize). These tiny pieces of stone essentially ground down their teeth.
If I remember correctly, because of this their average lifespan was just over 30 yrs.
Most people using stone grinding wheels throughout history has the same issue, from the beginning of farming up until a couple hundred years ago in Europe say. Archeologists use the amount of wear on a skeletons teeth to determine their age quite accurately.
This is also part of why white bread was historically considered healthier - removing the wheat germ and bran kind of faked the look of stone-grain-free bread.
Ah, an even better reference, from 1906, which also mentions teeth.
Lieut.-Colonel Allan Cunningham desired to contrast the
highly scientific process of grinding in use at the present
day in all civilised counties with the unscientific process
of grinding on a very large scale amongst the huge
population of North-West India, which was essentially a
wheat-eating population. The wheat was ground there in hand
stone mills; the grinding was coarse, and separation of the
bran very imperfect, there being a good deal of bran in the
so-called flour. The bread was unleavened bread, whereas the
bread eaten in this country was leavened bread, which made
in immense difference in its effect on the constitution. The
native flour was simply kneaded with water, and quickly
heated over a griddle. With the addition of a little milk,
butter, and salt, that was the staple food of the
population. The effect of the diet was that the population
were inferior on the whole in physique to Europeans, but it
must remembered that they did not have a varied diet. The
people had extremely beautiful teeth which they carefully
cleaned. One very curious effect, which was always ascribed
to the eating of the native ground what, was that the
natives were extraordinarily subject to stone, even little
children frequently having bigs stones in the bladder.
Journal of the Society of Arts, December 21, 1906.
https://books.google.com/books?id=DfpFAQAAMAAJ&pg=PA127
My ancestors threw off the archaelogists by only dining on the soft heated innards of dead animals. Their teeth were a pointed exercise in falsification.
Just a reminder that low life expectancy is largely the product of high infant mortality rates bringing down the average. If you were to survive to adulthood in the ancient world you would probably not die at 30, but something more like 60.
The same problem was with pharaohs. The stone tools that were used to make bread consisted mainly of sand which grinded ancient egyptians' teeth. National Geographic magazine had some x-rays that indicated that they were in pain.
If I remember correctly, because of this their average lifespan was just over 30 yrs.