Pennsylvania Dental Association Announces Winners of Annual Statewide Third-grade Student Poster Contest

HARRISBURG, Pa., April 11, 2013 /PRNewswire-USNewswire/ -- A $500 prize will be awarded to Mason Gray, a third-grade student at Linglestown Elementary in Dauphin County, for winning first place in the Pennsylvania Dental Association's (PDA) 2013 National Children's Dental Health Month...