The mercury is not sealed safely in the fillings but escapes through saliva and vapor into the body and brain. These dentists have the complex equipment in their offices that makes the removal of the amalgams a safer process. Many who choose to replace their amalgams are chemically sensitive to a greater or lesser degree. The symptoms of mercury toxicity are numerous. Later symptoms can be equilibrium problems, numbness of extremities, and tremors.
Mercury penetrates the placenta barrier and can adversely affect an unborn child.
Current research at universities in the U.S., Canada and Europe associate mercury toxicity with Alzheimer's disease. Mercury is a poison. It should be thoroughly researched prior to any dental or medical treatments.