get them out before they crack up your teeth... just like a thermometor, the mercury expands with heat, contracts with cold... doesn't take a rocket scientist to figure out that unless your teeth are also very athletic they will eventually show the strain and, oh well, crack, tough luck for you and a lifetime dental client you are.

and after 35 yrs I got mercury poison from a molar that did exactly that.. will probably have to extract the rest.

Your dentist is either a very good liar, a very good salesman, or not very smart. He certainly is not a good mechanic and I wouldn't even trust my chevy with a mechanic that recommended an unstable matrial like that to fill a hole in the radiator.

Maybe he figures he needs your business downline.

There are a lot of meth addicts around where I live, they say it's good stuff too. They have nice teeth also, for the time being.