Andy is right. I know people around me with fillings who are living good normal lives.

I cannot even enter a dental office wtihout becoming further severely poisoned by mercury (from the vapor in the office).

So mine is extreme. But again, I have heard of people being very healthy with amalgam in their teeth, everything is fine, years of good health and something comes along and injures them, or something hits their immune system down and then suddenly the mercury in them begins to poison them and they get mercury toxic symptoms.

So, it does come down to tolerance, but also obviously a person's immune system too, as mercury is always a threat, but many are healthy enough to where their body is keeping up and doing it's job.