General and Cosmetic Dentistry practice with Christopher Donohue, D.M.D and Paul Donohue III, D.M.D. Call for an appointment today! In the U.S., about 80 percent of adults above age 35 have gum disease, while 25 percent of those who are over age 60 have lost all their teeth. Given this rising population, it is estimated that the demand for dentists will rise by 21 percent through 2020