how a sneeze works? … When my nose has an irritant, why does most/all of the sneeze-air come out of the mouth instead of the nose?

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how a sneeze works? … When my nose has an irritant, why does most/all of the sneeze-air come out of the mouth instead of the nose?

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Because you didn’t shut your mouth? You have control of this.

[Your nose and mouth are connected in the back](https://cdn.britannica.com/78/74278-050-E4345BA2/Tissues-airway-soft-palate-sleep-apnea.jpg). When you sneeze, your lungs expel the air outward, the air will go out of wherever it can. You should have some control over keeping it from leaving your mouth, which helps expel the irritant.