Comes down to sugar content. Same reason why skulls of ancient peoples tend to have – generally speaking – better teeth. The majority of modern processed foods have ridiculous amounts of sugars, whether its actual sugar or corn syrup or other sweeteners. These give the bacteria in your mouth super food to grow and multiply and eat your teeth. Back then there was no corn starch or fructose whatever that didn’t occur naturally.
Animals can still get teeth problems, but same thing; they’re not eating a lot of processed foods with added forms of sugar.
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