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It's actually not natural to be a mouth breather. It's best to breathe through your nose. Mouth breathing can be caused by a few things. Usually, it's from having a blocked nose, like nasal congestion from allergies, a cold, or a sinus infection. A deviated septum, polyps, large turbinates, or even just the shape of your nose can all cause nasal congestion, which leads to mouth breathing.
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