Mouth breathing

Definition and stakes

James J. Walsh,  Psychotherapy

“ Mouth Breathing.—Since Meyer's discovery of the overgrowth of the {106} lymphoid tissue in the pharynx, we have learned to appreciate how important is mouth breathing, even for the intellectual life. We all knew before, and indeed from time immemorial it was well understood, that, as a rule, people who went around with their mouths open were of low grade intelligence. All sorts of methods were used to teach these young people to keep their mouths shut. ”
Source: Gutenberg

Emil Behnke,  The Mechanism of the Human Voice

“ The natural mode of quiet breathing [28] is through the nose; mouth-breathing is an acquirement. A new-born infant would choke to death if you closed its nose; it does not immediately know how to get air into the lungs through the mouth until after, by depressing the tongue, you have once made a passage for it. ”
Source: Gutenberg

Francis M. Walters,  Physiology and Hygiene for Secondary Schools

“ Cavities in the bones. 3. Front lower portion of the cranial cavity. In addition to removing dust particles and germs, other purposes are served by breathing through the nostrils. The warmth and moisture which the air receives in this way, prepare it for entering the lungs. Mouth breathing, on the other hand, looks bad and during sleep causes snoring. The habit of nose breathing should be established early in life.34
Cultivate Full Breathing.—Many people, while apparently taking in sufficient air to supply their need for oxygen, do not breathe deeply enough to "freely ventilate the lungs."
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Source: Gutenberg

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