Australian Aborigine in Swamp Darwin
Phys.org has an article on dental changes associated with the transition from hunter-gatherer cultures to less mobile agricultural ones. The transition occured 10,000 to 12,000 years ago at the end of the Paleolithic period. Some quotes:
“Our findings show that the hunter gatherer populations have an almost “perfect harmony” between their lower jaws and teeth,” he explains. “But this harmony begins to fade when you examine the lower jaws and teeth of the earliest farmers”.
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The diet of the hunter-gatherer was based on “hard” foods like wild uncooked vegetables and meat, while the staple diet of the sedentary farmer is based on “soft” cooked or processed foods like cereals and legumes. With soft cooked foods there is less of a requirement for chewing which in turn lessens the size of the jaws but without a corresponding reduction in the dimensions of the teeth, there is no adequate space in the jaws and this often results in malocclusion and dental crowding.
You can read the original research report in PLOS One.
Steve Parker, M.D.
This bedrock metate was used by Indians (aka Native Americans) for grinding maize, acorns, and other foods. Rainwater fills this 4-inch deep rounded depression in granite about 10 miles from my house.
Paleo Diabetic 
I am skeptical that this is about “soft cooked foods” (cooking predates agriculture) instead of about a good dietary source of Vitamin K2 that suddenly dried up in the neolithic. Maybe auroch brains were suddenly unavailable? When you supplement MK-4 you can see its effect on the teeth but the dental establishment is apparently still unaware.
I have to agree with the previous poster. If anything, harder foods wear the teeth more than softer foods. I think the issue is also related to the nutrient shift of the different foods rather than a move from raw to cooked food.