Shamar Grier, 7, can't bear to look as he gets a free dental exam at the Pinellas County Health Department in St. Petersburg on Wednesday. The department has been offering free back-to-school screenings. About 180 people came to downtown St. Petersburg on Wednesday. Residents in the north end of the county got a turn at two screenings later in the week. Patients got a free checkup with X-rays and could make appointments if more work was needed.