How many of us know that one of the constituents of vaccines is thimerosal which substantially contains mercury. As mentioned in the book Mercury Poisoning: The Undiagnosed Epidemic by David Hammond , Mercury is one of the major factor for causing and increasing autism. But probably there is no alternative for vaccines and hence it cannot be avoided. That is why in such cases David has created the awareness and has left the choice open since there is logically no reason in telling to avoid vaccines. Similarly in case of dental amalgams, there also we have a considerable amount of mercury though there are certain agencies like the American Dental Association that claims it not to carry any volume of mercury. But since here there is a choice to avoid dental amalgams, David clearly prefers readers to go for the alternative for dental fillings.
Overall Mercury Poisoning: The Undiagnosed Epidemic by David Hammond is an interesting and enlightening read for all to learn a lot that is factual but is not known to us.