i've been lucky that i really have had great professors. i've only had an issue with one in grad school, and he wasn't really a professor. in your last two years of school, you spend a lot of time working on patients. there are local dentist that will teach on the floor and an walk you through procedures. he may have taught a one credit lab, but i'm not even sure about that.
the guy and i just didn't get along. i could see that fury in his eyes when realized he was stuck with me. he was just one of those guys that was put through the ringer when he went to school, so he felt others had to go through the same. well...very early on i learned that if i simply acted like i didn't care about his nonsense, it would send him up the wall. he once told me to take a pencil, put it in my ear and push it until it hit my brain. that ***** is hilarious, so i laughed. i was honestly laughing because i thought it was funny, but it happened to be right in his face, and he ***** lost it. i had to have a "talk" with the guy that ran the clinics who i was a teaching assistant for. it wasn't a big deal, but that was my only lousy experience.