Ricardo Thomas / The Detroit News

Volunteer periodontist Dr. Barry Mentzel of St. Clair Shores examines the teeth ofJuan Cervantes, 13, of Sterling Heights at the University of Detroit Mercy free dental clinic event Feb. 3, 2007. The clinic, the third annual Give Kids A Smile event, paired volunteer dental professionals and low-income youth from across Metro Detroit. Dr. Mentzel found Cervantes' teeth quite healthy, except for one cavity.