Dental amalgam is 50% elemental mercury, one of the most potent neurotoxins known to man, and is installed in toddlers mouths, they then breathe in the mercury vapor which is chronically released especially during chewing, this has been known since the 19th century and was even a large reason why the ADA was formed, research the 19th century amalgam wars. The lungs are the worst method of absorption as it directly enters the bloodstream. They drill and fill this neurotoxin due to so called micro cavities, which can only be seen on xray. Many might have been misdiagnosed with autism when erethism might be the cause.