Literally amalgam means “mixed with mercury,” and in dental terms, this is true because the composition of the ones used in fillings is formed by 50% Mercury (Hg) and other metals as silver, copper, zinc and tin, that when mixed it hardens in a few minutes at room temperature.
Until recently it was thought that the mercury didn’t come off from the amalgam once it hardened. Now, we know that mercury detaches from the amalgam every minute of the day. On average, an amalgam releases approximately 34 micrograms of mercury per day (plus – minus 2 micrograms) .”(IAOMT)
What happens in your mouth?
Mercury besides evaporating at 20 ° C, it begins to react chemically with the saliva, with acidic foods and citrus, with the fluoride from the toothpaste, food and hot drinks, bruxism, chewing gum, to have additionally gold fillings, braces or bridges of other metals, tobacco, the acid pH of the mouth, electromagnetism, etc …. Furthermore amalgam fillings have an electric current that can be measured (due to binding of the metals). The higher the current, more mercury will be released.