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I question this, I can think of other places with lots of very delicate nerve endings that would probably hurt worse...
oops... #8
Although not technically correct, think of your tongue as a casing with different sets of muscles within in. There are muscles attached to the tip that go to the back, ones that go up and down, and sideways muscles. These all allow us to shape and contort our tongue for mastication, swallowing and speech.