Harry Day ’30, an early researcher into the use of fluoride in toothpaste, died at the age of 100 on Sept. 8, 2007, in Bloomington, Ind.
Day was a prominent researcher in nutrition at Johns Hopkins and Indiana University, where he served as chairman of the chemistry department from 1952–62. While at Indiana, Day was involved in research into the effects of fluorides in the reduction of cavities and tooth decay, resulting in the first fluoride toothpaste, Crest.
He is survived by two daughters and a son, four grandchildren, and 11 great-grandchildren.
