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Mouth breathing was not known among the early races, the present pure races or modern uncivilized races, neither are deformities of the jaws and teeth. You will all admit that mouth breathing is becoming a very common occurrence among our own people, and so are also irregularities of the jaws and teeth. It stands to reason, then, that the causes which will produce the one must necessarily, in many cases, produce the other.
In an otherwise able article upon the subject of "The Influence of Adenoid Hypertrophy at the Vault of the Pharynx Upon the Development of the Hard Palate," read before the New York Odontological Society, November 19, 1890, by Dr. D. Bryson Delavan, the author speaks of mouth breathing as a cause. He says: "The mouth breathing habit compels the constant dropping of the lower jaw, which, hanging by the cheek from the superior maxilla, causes constant pressure
TALBOT ES. MOUTH BREATHING NOT THE CAUSE OF CONTRACTED JAWS AND HIGH VAULT.Read Before the Section of Laryngology and Otology, at the Forty-second Annual Meeting of the American Medical Association, at Washington, D. C., May, 1891.. JAMA. 1891;XVII(14):505-511. doi:10.1001/jama.1891.02410920009002b