nemfrog:

The teeth. Health knowledge. a thorough and concise knowledge of the prevention, causes, and treatments of disease, simplified for home use. 1920.

From http://kianorshahmohammadi.com/post/152902172945

From https://dentaleconomicsus.wordpress.com/2016/11/08/nemfrog-the-teeth-health-knowledge-a-thorough-and-concise/

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