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Definition of Yawn

Yawn: Involuntary opening of the mouth, accompanied by slowly breathing inward and then outward. Repeated yawning can be a sign of drowsiness, boredom, or depression. The yawn helps to open tiny air sacs (alveoli) in the lungs that can collapse during shallow breathing.

QUESTION

What causes tooth decay? See Answer
Reviewed on 12/27/2018

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