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In other primates such as gorillas and chimpanzees it seems that 90 degree jaws are rather common.
Here's a hunter-gatherer skull
https://wholebodybreathing.com/community/community/main-forum/ideal-gonial-angle/#post-279
Perhaps. Probablt. Especially if the anthropological record supports it.
In that pos it’s said by one person that studies suggest 105, 110 degrees as ideal. but i agree with the reply that suggests “those studies” are as influenced by the post-industrial bell curve just like traditional orthodontics is.