Greenstein graduated from New York University College of Dentistry in 1972 and received his postgraduate periodontal training from the Eastman Dental Center in Rochester, New York, completing the program in 1980 and receiving a Masters' degree from the University of Rochester the following year.
Greenstein graduated from New York University College of Dentistry in 1972. Greenstein received his postgraduate periodontal training from the Eastman Dental Center in Rochester, New York. Greenstein was completing the program in 1980. Greenstein was receiving a Masters' degree from the University of Rochester the following year.