Amos John E DDS

I went into Dr. Amos for a cleaning and a tooth cap, and in those 2 things he was good (cap is still on).
However, he noticed I had a metal brace on my bottom teeth, which I got after having braces years back, and advised I have it removed. I told him my previous dentists said it was fine to leave it, and that I would rather not take the brace off.
He conceded, and proceeded (nice rhyme?) to clean my teeth, culminating with a good-​old flossing session.
While flossing rather violently behind the aforementioned brace, he snapped it from one of my teeth, rendering it extremely uncomfortable and in obvious need of removal, since it couldn’t be re-​cemented.
He proceeded to removed the rest of it, which took about 45 minutes, never mentioning that he was planning on charging me, in full, for the procedure.
When my bill arrived a few months later (2 ½ to be exact), I didn’t open it for a while, thinking my insurance had covered most of it and that it wasn’t urgent.
When I did open it about a month after it arrived, I noticed that while the two procedures I had oringinally gone in for were mostly covered by insurance ($ 100 left to pay) as expected, there was a $ 200 «undisclosed dental procedure» charge, which I knew must have been the brace removal.
Upon calling Dr. Amos and inquiring as to why I was being made to pay full price for a procedure that we had both agreed was not to be done, he stated that «it really did need to come off», a convenient diagnoses after he had broken it off accidently, and in complete contradiction to what we had decided at the appointment, which was that despite his feeling that it «should» come, it did not actually «need» to, and would not, come off.
Not being a very good in-​person/​over-​the-​phone haggler, I agreed to pay for half of the procedure, though in retrospect it seems obvious that I should not have been held finacially responsible for the consequences (45 minute unplanned procedure) of his mistake.
Partly out of absentmindedness and partly due to a new job where I was traveling non-​stop, paying the controversial bill was put on the back burner of my mind, until a heated phone call from Dr. Amos a couple weeks ago, where he pointed out that it had been «6 months since the work was done».
While I admit to being late with the check, he distorted the picture, since it had only been 2 months since we had actually settled the bill, which was originally a considerable (33%; $ 300 was reduced to $ 200) overcharge (considering that I really shouldn’t have been charged for any of the brace removal, it was really a 66% overcharge).
Its a shame because he seemed like a nice enough guy at the appointment, recommended by a friend, and trusted dentists are hard to come by.
I just don’t see why he would insist on getting this extra $ 100 dollars from me for such an obvious bogus charge, at the risk (now reality) of losing a potential long-​term client.