Last year, Dr Piesman missed seeing a small cavity on xrays of my daughter's teeth -- resulting in a root canal this year. The dentist that I am now using said quite bluntly that the cavity is now so large that there is no way it would not have shown up on x-rays one year ago.
Personally, I actually liked Dr Piesman and his staff, although the exam and cleaning was performed quickly (15 minutes) and it was obvious from the packed waiting room that efficiency was a necessity.