A manual of personal hygiene : proper living upon a physiologic basis / by American authors.

  • Pyle, Walter L. (Walter Lytle), 1871-1921.
Date:
1907
Catalogue details

Licence: Public Domain Mark

Credit: A manual of personal hygiene : proper living upon a physiologic basis / by American authors. Source: Wellcome Collection.

Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.

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    cisors are directed outward and the lower incisors somewhat inward, as ilhistrated by Fi<^. 5. The habit of breathing through the mouth is commonly associated with that of thumb-sucking. From liiHllii,ll,„iJilut ™i(i|iuiiii>i'» '•*' Fig. 5.—Deformity caused by thumb-sucking (Darby). whatever cause arising, habitual breathing through the mouth leads to the accumulation of organic mat- ter about the teeth and thus favors the destruction of dentin'. Certain families through several genera- tions have soft or feeble teeth, apparently because of some congenital disturbance in the nutrition of the parts. It is commonly believed that in such individ- uals much more care is required to prevent the devel- opment of caries. These poorly developed teeth are sometimes seen in scorbutic or rachitic children, and Fig. 6.—Teeth in congenital syphihs. in those suffering from congenital syphilis; but the con- dition is also present in those wdio in other respects ap- pear to enjoy good health. In congenital syphilis the secondary teeth are affected in a characteristic way