I remember getting bad vibes when I went to meet with a dentist about having my wisdom teeth (all 4) pulled. Just small things, like springs missing on the overhead lights they pull down to look at you, a desk clock that they drilled into the wall to make it a wall clock, etc....anyways, I made an appointment but still had bad feelings about the place. I debated canceling but was having problems with my teeth and already had the appointment set so I went. It ended up being a bad experience, was in the chair for 7 hours....he couldn't get the bottom two out and kept chiseling away......he kept leaving the room for like 45 minutes at a time and the gauze in my mouth was saturated with blood so I actually went through the drawers in the room and found some and changed it myself......I stopped him from even trying the second bottom one and he was like "when people do this they historically don't come back and have the last one pulled" and I was thinking no shit, they go somewhere else, which is what I later did, and had a great experience there.
Moral of the story, trust your gut instincts.