I sometimes get a bit of a reaction from the dentist's office. My dentist is a regular dentist, however he uses high power suction when drilling out amalgams. I don't think there are such high mercury vapor levels there. I think the reaction I get is from the disinfectants and other chemicals(ie. those used develop xrays, and those used for dental procedures). My dentist very rarely uses mercury fillings anymore.

It is a good idea though not to spend too much time in the dental office waiting room. If you are very early for your appointment, then try to wait elsewhere.