Probably not: Mouth breathing is usually done because the nasal passages are swollen and congested, forcing a person to breathe through their mouth. Persons with asthma frequently have allergies. An allergist or ENT doctor would be a good resource to assess the reason for mouth breathing.
Answered 6/10/2014
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No: If you ever have a bad cold or allergies bad enough your nasal passages swell/close you are left with mouth breathing. There is a fraction of the population that usually mouth breaths in sleep, or to augment their airway during exertion. Asthma is a complex process that is often mimicked by other conditions.
Answered 11/6/2017
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