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Option 1 : Wisdom teeth
Wisdom teeth are considered a vestigial organ -- no longer useful -- because our diet has evolved. Early humans ate a mostly raw diet of foraged plants and hunted animals, which required a lot of rough chewing. That wore down their teeth. By the time wisdom teeth, the last molars, erupted between ages 17 and 25, their other molars and teeth had worn down, allowing room for the wisdom tooth to come in.
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