Just tell the dentist you don't want the mercury fillings and set up an appointment to have them taken out. Dont let the dentist bully or intimidate you. If they try, find another dentist. They will charge through the roof for taking them out. I am gradually having mine taken out. The first ones I had out, I was sick for two days afterward. No protection from me breathing the atomized mercury, they used the suction on me, so I never felt like the pieces were cleaned out of my mouth properly. The next time, I took my own safety mask and insisted that I use it, and that they start up the old water in the cup then spit routine, and I swished and swished every chance I got to get all the crumbs out. I didn't get sick the second time. Have two more to go, and they charge quite a bit to do it, and my insurance doesn't cover. But it's worth it. Dentists who believe there are problems have a special setup where you get a mask to breath oxygen rather than the fumes.
My dentist continues to tell me the fillings cause no problems. But think of it - if they ever do admit it, there will be mass lawsuits filed, especially from those of us who have complained and argued with them for years. So they can't afford to admit it. But who in their right mind can believe them? The fillings taken out have to be treated as hazardous waste, we can't even have mercury thermometers any more. But in our mouths, it is harmless????? Do they take us for fools? It's probably more about money - take a cheap substance and stick a high price on it. Kind of like cigarettes. The people making the money don't care about our health.