Why should we breathe only through our nose?
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Nose breathing, especially the resistance to airflow that comes from exhaling through your nose, keeps the air in your lungs a little longer. ... Breathing through the nose helps remove a significant share of germs, irritants and bacteria from each lungful of air you breathe.
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Simply, because air contains dust particles, pollutants and germs. Breathing with your mouth means taking in a significant amount of all these in one breath. It can be harmful to the lungs. Breathing through nose is highly important as it has mucus and hairs that traps and filters dust and other particles.
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