According to the World Health Organization (WHO), mercury is considered to be among the top ten chemicals of major public health concern. It is known to impact the brain, heart, lungs, gastrointestinal tract, kidneys, and immune system. There is no safe level of mercury exposure.
Dental amalgams have been used for the past 150 years by the dental industry to fill cavities. Dental amalgams contain mercury, a known neurotoxin dangerous to humans even in trace amounts. Mercury vapor leaks from dental amalgams and accumulates in various body tissues or organs. Therefore, the fetus of a mother with dental amalgams will be exposed to mercury for the entire duration of the pregnancy. Mercury is known to cross the placenta, and directly impact the fetus, where it can interfere with the development of the fetus’ brain and central nervous system. The child may continue to be exposed after birth through the mother’s breast milk. One study found 6 or more dental amalgams in the mother raises the risk of having a child with autism 3.2-fold. Furthermore, the severity of autistic behaviors increases with the number of a mother’s dental amalgams.
Other sources of mercury include some over the counter medications, personal care products, and certain fishes such as tuna. In addition, some vaccines still contain mercury.
Mercury in thimerosal has been linked to tics, speech delay and language delay in children (Thompson et al. 2007 NEJM, Barile et al. 2013 J Pediatr Psychol, Verstraeten et al. 2003 Pediatrics, Andrews et al. 2004 Pediatrics) and many published studies also show a relationship with autism and ASD (Geier et al. 2013 Translational Neurodegeneration 2:25, among others)