Well yeah, we get enough toxicity already that I wouldn't want to keep anything on/in me that is permanently leaking out a toxin like mercury 24/7. Also it increases with hot fluids/chewing etc.

And you're right, when you have mercury, you tend to cling onto other toxins/metals as well. I think every scrap of amalgam apparently must be out, before the body starts to detox any mercury inside the tissues/organs.

But again, I do not know how severe one old filling would be. Possibly far less than others, but if the person is sensitive to it? Then it will still be a challenge to the immune system regardless of the amount of mercury coming off it. Some people's immunity reacts badly to metal. Mine does. I cannot even wear most jewellery.