[cmelloy]

Is there any internet sites available to check a dentist back history, to find out if he might have had bad practice issues in the past

[J_9]

It all depends on where you live. You can try googling the department of health for your State (if you are in the U.S.). Many Health Departments have a License Verification link where, at least in my state, you can check if the dentist is licensed and if he has ever lost any malpractice suits.

Good luck.