does anyone know how i can tell for sure?

How to tell that the mercury is gone:

1. Lack of symptoms
2. A steady improvement that slows down and stops.
3. Lack of side effects of chelators
4. Increased sensitivity to small amounts of mercury in environement.

No one knows how much mercury will remain in your brain. The medical establishment prefers to poison us with mercury so they will not do the research. The only substances (besides sulfur based foods) that cross the blood brain barrier and possibly chelate are ALA and cilantro. Cilantro has made some people quite ill.

How long since you removed your amalgams, how much improvement , what where your symptoms?