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Hunter-gatherers did use their teeth as a tool:
"Today such actionsare relatively uncommon, as we have alarge array of specialized tools to carryout these tasks. In the past teeth wereused for a large variety of tasks, such asinitial preparation of food, preparation ofmaterials such as leather and fibres andwoodworking. This was particularly trueof hunter-gatherers and may well have hada considerably greater effect on tooth wearthan eating itself. Consequently, mostgroups of hunter-gatherers, both ancientand recent, have been noted for their highrates of tooth wear."
file:///C:/Users/Owner/Documents/26-104-1-PB.pdf
Inuit women have traditionally chewed on animal hide in the process of making clothing.
https://books.google.com/books?id=52...20tool&f=false
I can't find a citation right now, but I believe tree bark was also chewed on to break it down for uses in clothing.
It seems some groups knew enough to chew on the willow bark, which is a source of salicylic acid. Certain kinds of pine bark were also eaten in times when game was scarce.
https://en.wikipedia.org/wiki/Salicylic_acid
The jaw is somewhat different, but I think Pinhasi has proposed that chewing on raw vegetables and meat required bigger jaws, and with the advent of cooked food, and especially by Neolithic times, the jaw size was shrinking.
Perhaps this was a hunter-gatherer trait her group retained, as well as a result of the work she did?
Non si fa il proprio dovere perchè qualcuno ci dica grazie, lo si fa per principio, per se stessi, per la propria dignità . Oriana Fallaci