Member American Assoc OF Orthodontists, Member American Dental Association, Member Ohio Dental Association, Member Corydon Palmer Dental Society, Member Cleveland Dental Society. In the U.S., about 80 percent of adults above age 35 have gum disease, while 25 percent of hose 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.