Awful.
A few more cases-
Dental visit ends with Harlingen boy
Blue Island teen dies after root canal - Chicago Breaking News
When I was a kid we had a crook dentist. Little did I or my siblings know and it took awhile before my parents caught onto the scam. We'd go in for a routine check-up and the dentist would say we have cavities start drilling away and filling with some white crap. My mother was sort of surprised but since this was a well known dentist in town with a nice place and after he explained 'how great this magic filling was', she would pay the bill and away we went. Six months later, the dentist tried the same thing but my mother knew we had no cavities. Never returned.
A few months later, the white mortar started to break apart and fell out. We went to a semi-retired dentist working out of a room in his home. He was PO and told my mother none of it was necessary. He cleaned out the crap fillings and replaced with silver. Fees were whatever she could pay or even nothing.