Word: dentin
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Dates: during 1930-1939
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...normal human tooth consists of a very hard outer casing, enamel where it projects beyond the gum, cementum (bone) inside the gum line; a less hard inner body of dentin (ivory); and at the core a soft pulp which contains an exquisitely sensitive nerve. Practically all dentists treat the hard enamel and dentin as though they are dead substances...
Still curious about teeth although he has filled them for 40 years, Columbia University's Professor Charles Francis Bodecker proved what few other dentists suspected-that the multitude of very fine passages in the hard dentin and enamel are filled with a fluid which he named "dental lymph...