The questionable substance is thimerosal, an antibacterial substance used to prevent contamination of the vaccine. Researchers at Columbia University are concerned that some children receive several vaccines in one visit and that could conceivably add up to the precautionary limit of mercury determined by the EPA, Environmental Protection Agency. The Associated Press article stated the mercury toxicity leads to brain damage. The harmful mercury-containing substance, thimerosal is not in all vaccines, but is currently in the hepatitis B and DPT vaccines. Probably the most controversial issue concerning mercury toxicity is in the world of dentistry.
Most dental amalgams contain mercury and they are poisonous.
About 98 percent of the North American population develops cavities, and mercury amalgams are packed into four fifths of them. Common symptoms of mercury poisoning are arthritis and inflammation, cardiovascular disease, digestive problems, dementia, and allergies. Psychosomatic, unknown, or mysterious conditions, often related to allergies may clear up after the mercury amalgams are removed from the mouth. Though mainstream dentistry does not agree that the mercury amalgams are causing so many problems, there are some dentists who believe that the best thing to do is to remove the amalgams. This must be done very precisely by someone who knows and understands this process, because mercury can slip into the body when the amalgams are being removed.