Word: keratin
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Dates: during 1940-1949
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Promptly (in some cases within 24 hours), their gums began to harden, and healthy new tissue began to form the outer keratin layer, forming "a coat of armor" against bacteria. "This improvement," said Dr. Ziskin last week, "was seen not only in cases which had been partially helped by other methods, but also in the stubborn cases which showed no evidences of healing under routine procedure." In some cases, treatment was carried on over a period of two or three months...