My dentist is a dormouse, actually.
Taking the OP seriously*, it is incorrect to say that “the American Dental ass. has claimed mercury is harmless”. The ADA notes the scientific consensus that mercury-containing amalgam fillings do not cause disease.
The OP might just as well claim that dermatologists believe botulism toxin is harmless, since they haven’t acted against the use of Botox.
Or he could argue that radiologists think ionizing radiation is harmless, since they endorse the use of radiation in imaging and radiation therapy.
The OP needs to review the concept of “the dose makes the poison”.
*which could be indicative of early-onset dementia.
Obligatory music link…
I see that and raise you
I dunno about Mercury, but can your dentist see Uranus clearly at night?
Figures you’d chime in on a mercury thread. 
Oboy. I’ve never seen a banning as it happened. This will be my first!
You have been told on several occasions that your post-and-run style providing minimal content is not appropriate to this forum. More recently, you were told that if you continued, you would be subject to sanctions.
This is a Warning that you are fast approaching the point where you will be banned for ignoring staff instructions and deliberately spamming the board with JAQing off style nonsense.
[ /Moderating ]