Biological Dentistry involves putting compounds in people's mouths that will not poison them or create a reaction of their immune system.

Biological Dentistry involves putting compounds in people's mouths that will not poison them or create a reaction of their immune system. When a dentist puts a silver amalgam filling in your mouth you have a filling that contains 50% mercury. It is really a mercury amalgam. Mercury is the most powerful brain poison (neurotoxin) on the planet. And, according to the research of Dr. Hal Huggins, D.D.S., M.S., there is a 92% chance that your immune system will start to fight the presence of dental mercury circulating the body. In many cases dental mercury will win this fight and create disease.

His book It's All in Your Head is an excellent expose of the dangers of dental mercury. It tells the reader how to have mercury fillings replaced with non-toxic plastic fillings. Another excellent book on the same subject is Silver Dental Fillings - The Toxic Time Bomb, by Sam Ziff.
Mercury from your fillings leaches into every tissue in the body. It travels to the brain and the kidneys and to every organ and system in the body, including the cardiovascular system. It can destroy the immune system. When you have bio-compatible plastics put in your mouth by a biological dentist your tissues and organs will not be poisoned, your nervous system will not be affected, and your immune system will not be destroyed.
After you have your mercury fillings replaced with plastic fillings the metal ions are still in your tissues and they can continue to poison you. You can remove these residual metals from your tissues by doing DMSA chelation.

more informations here: chelation