She works at P.S. 21, P.S. 33 and P.S. 76. Her teeny patients are poor. If it weren’t for the city’s Oral Health Program, many wouldn’t see a dentist at all. Mayor Michael Bloomberg is ready to eliminate the program, a staple for 95 years. The city will save $2.5 million. More than 17,000 low-income children participate in OHP; dentists like Mahoney perform 35,000 exams each year. Barring a miracle, the program will cease to exist on June 30.