Teeth are an invaluable nuisance. They have to be looked after, and yet the most dentist-conscious nations have the most trouble with their teeth. Dr. Hans H. Neumann, a Columbia University researcher, seems to feel that all civilized man can do about it is to sell his teeth dearly. Dr. Neumann declares with Spartan glumness: "The incidence of toothbrushes in different countries is in inverse proportion to the incidence of sound teeth, and poor oral hygiene is predominant in areas with exceptionally good teeth." (Dr. Neumann was thinking particularly of a sight he saw in Samoa: a native nurse, who...
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