eli5: Why do we make the scrunched up “sour” face when we eat something sour?

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eli5: Why do we make the scrunched up “sour” face when we eat something sour?

In: Biology

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It’s an evolutionary response to protect your teeth. Sour tastes means acid which is bad for your teeth and scrunching your face pulls liquids in your mouth towards the center away from your teeth.