Obviously any mercury in your body is bad, however how much is enough where i get to the point where i start to really feel physically ill. If a person had one tooth filling, a tooth could only be a about 1cm wide by about 1/2 cm deep, probably holding about a teaspoon of mercury in the tooth ?? Obviously people with more than one filling need help, but for one tooth, would that affect you also ? And only one tooth would be easier to get out of oyur body.