I went for a root canal retreatment. He started giving me a quote for a bunch of procedures never mentioned before by any endodontists - and I've had a lot of root canals - then after trying for 2 hours he said he could not save the tooth so put the crown back on w/o any medications. He charged me nonetheless.
The day after I was in hell and had to go see my dentist who was surprised he didn't even give me some antibiotics.