i had my removed 10 years ago, it was with this special ecuipment, like fume-sucking-thing, the denitist recommanded me to use carbontabelets, and he was also usin this rubber-child around the teets he was drilling. all this made my mercury removal totally "painless", but i had one removed by normal denist, and after that i had a little symptoms, like fever and dizziness the following day.....it can imagine that i wold have been ill if i had everything removed witout protection....some say it is quite dangerous....and i would agree in that statement...
the special equipment is cheap, like 10$ for each tooth, i would recommand paying for this.....