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When we sneeze why our mouth opens?

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An open mouth equalizes the pressure inside your nasal passages , otherwise you would be in a lot of pain and could damage your eardrums. Notice when you have a cold that your ears often are "stopped up"?

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Sneezing is a protective mechanism that the body uses to expel dust, pet hair and other allergens. Some people sneeze when they're exposed to cold air. It's common to sneeze when you have a cold because the inside of the nasal cavity becomes swollen and more sensitive than usual.

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It is a natural reflex action.

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To take in oxygen

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If you don't your going to pop your ears

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Too much pressure to keep it closed :)

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Hmmm i guess awain e because of pta nahe :P

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hahahaha///
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