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What will happen if a human being starts taking air with mouth instead of nose?

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When we inspire, the air moves through our nasal passage where the presence of nasal hairs and mucus prevents the entry of harmful substances into the body with this air. Moreover, they also reduce the temperature of air.

When we inspire, the air moves through our nasal passage where the presence of nasal hairs and mucus prevents the entry of harmful substances into the body with this air. Moreover, they also reduce the temperature of air.

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