My experience- unnecessary extractions, incomplete patient chart, "loss" of X-ray and charges for services never provided, improper fit of dentures and refusal of dentist to follow up. This is a definite case for the Board of Health.
Dentists are not held to any standard of practice in the way physicians are.
They can basically do (or not do) as they please without any accountability. With the exception of nerve injury or severe infection, patients are left without recourse.
Dental practices under the umbrella of insurance companies are not quite as callous in their treatment of patients. Independent practioners are corrupt and greedy.