Among dentists whose patients had trouble enunciating "s," or "t," or "th," there used to be a standard joke: "What we need is English-speaking dentures." In the March Journal of the American Dental Association. Dentist Howard E. Kessler of Cleveland reports that the jokesters were right. It is much harder to make dentures for English-speaking patients than for those with another mother tongue.
Cleveland, with a big foreign-born population, has given Dr. Kessler ample opportunity to see the differences. The vast majority of patients whose native language is not English, he finds, form the sounds of n, l, t, d, s and...
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