Presumptive U.S. Democratic presidential candidate Barack Obama is presented with a dental hygiene kit...
Presumptive U.S. Democratic presidential candidate Barack Obama is presented with a dental hygiene kit by Dental hygienist student Holly Siemens during a campaign stop at Wayne County Comunity College District in Taylor, Michigan June 17, 2008. REUTERS/Rebecca Cook (UNITED STATES) US PRESIDENTIAL ELECTION CAMPAIGN 2008 (USA)