Mercury is the second most toxic element in the world. The most minute amount damages cells. More than 2/3 of the excreted mercury in humans is derived from amalgams; mercury crosses the maternal placenta into the developing fetus; it is capable of inducing auto immunity diseases; mercury immediately and continually challenges the kidneys, it can enhance the prevalence of antibiotic resistant intestinal bacteria, and people exposed to mercury are at risk to lowered fertility.
This is only a partial list.
What are the alternatives to Amalgam fillings?
Dental composite (the restorative that is used with tooth bonding technique) has been the material of choice for creating tooth-colored fillings for front teeth for many decades (since the 1960’s).