It seems like if people nowadays don’t brush their teeth often, they diminish and rot until they fall out. Before the toothbrush was invented, did people just lose all their teeth by their 20s? And how do animals teeth stay clean?
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A few people mentioning sugar but carbs in our diets specifically are a big factor too. Bread getting stuck to your teeth breaks down to sugar gradually and causes a lot of decay. Plants were also totally different, much less sweet and more and larger veins + seeds.
When people were eating meat and fibrous plants they didn’t get much decay from their diet.
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