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At all events, there are now on record cases of children whose parents, grandparents, and great-grandparents are known to have been mouth-breathers, and who have on that account been sharply watched for the possible development of adenoids in early life, and these removed as soon as they appeared, and they have grown up with well-developed, wide nostrils, broad, flat palates, and regular teeth, overcoming "hereditary defect" in a single generation.
If we are mouth-breathers, our jaws will grow out of shape, so that our teeth are crowded and irregular and do not meet each other properly in chewing. Pressure upon the roots of the teeth, from meeting their fellows of the opposite jaw in firm, vigorous mastication, is one of the most important means of keeping them sound and healthy.
These swollen glands are called adenoids, and cause not only mouth-breathing, but deafness, loss of appetite, indigestion, headache, and a stupid, tired condition; so that children that are mouth-breathers are often two or more grades behind in school, poor students, and even stunted and undersized. You can often tell them at sight by their open mouths and vacant, stupid look.
The German staff might be as good as ever, but among the mixed troops the old and the young, the hollow-chested and the square-shouldered, mouth-breathers with spectacles and bent fathers of families, vigorous boys in their late 'teens with the down still on their cheeks and hardened veterans survivors of many battles east and west they were reverting appreciably to natural human tendencies despite the iron discipline.
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