is it safe to fix a tooth in a place where mercury is used?

Hi, i have ahuge hole in my tooth , and need it to get fixed right away, but the only way i can get it fixed NOW is if my mom pays for it as a christmas present at HER dentist which uses mercury in the office. I will not choose for my tooth to be fixed with Amalgam of corse. I will choose the white composite filling. I would think that the dentist is not so smart and/or careless to use something as toxic as amalgam. I have alreddy 9 malgams in my teeth allreddy, and my goal is to get them tooken out someday, once i can save money for the removal. I just would like some kind of advice of if it will really affect me if i get treated in a dentist office which uses mercury???? And if it is harmful, is it relly harmful? I think to myself that i have no choice, cuz i have no money, and my mom has no money ither, that is way i must go to her "cheep" dentist. I feel forced to do it asap, before the real big pain comes.
Thank you for every bodys support!!!! I love Curezone, and i am always refering people!
!~ Sab Tweet