I wouldn't do it. One thing I discovered in my "quest" to become mercury free is that some people, me especially are seriously affected energetically by the fillings. Just having the fillings on my meridians was completely screwing up my body and immune system.
So a little "test" chelation that me in my doctor at the time attempted when I still had fillings in ( Just to see if it was possible for me to chelate with the fillings in ), resulted in a very bad reaction consisting of hives and rashes all over my body and bad digestive problems.
Chelation is still hard, but without the fillings, I don't have nearly as bad of a reaction.