
Suppose we are eating sandwich. Our front teeth cut and tear the sandwich. The molars grind it, saliva, the juice in the mouth, gets everything moist.

The moist of the food is carried to the back of the mouth by the tongue. Muscles force the food into to esophagus, behind the windpipe. Other muscles force the food to esophagus. They do their work so well that the food would travel along even if the person were doing a headstand.
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