Except that we have records of the bones. We can literally look at ancient people's skulls and teeth. If what you say is true, then we should find just as many skulls of ancient peoples with bad teeth as modern people, but we don't. Did all ancient people have perfect teeth? Of course not, but they had far healthier teeth than we do today. Even mainstream sources admit this. Here are some links:
https://truththeory.com/scientists-reveal-ancient-romans-healthier-teeth-diets-low-one-substance/
https://www.medicinenet.com/script/main/art.asp?articlekey=167917
https://www.smithsonianmag.com/smart-news/prehistoric-humans-had-better-teeth-than-we-do-26567282/
https://stanfordpress.typepad.com/blog/2018/05/why-cavemen-needed-no-braces.html
Except that we have records of the bones. We can literally look at ancient people's skulls and teeth. If what you say is true, then we should find just as many skulls of ancient peoples with bad teeth as modern people, but we don't. Did all ancient people have perfect teeth? Of course not, but they had far healthier teeth than we do today. Even more mainstream sources admit this. Here are some links:
https://truththeory.com/scientists-reveal-ancient-romans-healthier-teeth-diets-low-one-substance/
https://www.medicinenet.com/script/main/art.asp?articlekey=167917
https://www.smithsonianmag.com/smart-news/prehistoric-humans-had-better-teeth-than-we-do-26567282/
https://stanfordpress.typepad.com/blog/2018/05/why-cavemen-needed-no-braces.html