Plaque pH in six adult subjects was monitored while they consumed a meal containing three foods. The marked fall in plaque pH caused by drinking sugared coffee was considerably reduced by eating the two non-sugary foods (egg and crisp-bread) before, during, or after the sugared coffee. This favorable action was negated by a pause between the sugary and non-sugary courses.Received for publication March 20, 1980 Accepted for publication July 30, 1980
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