What amount of mercury does a person take into the body from natural sources and how much comes from amalgam fillings?

The amount depends on a number of factors, such as the type of food you eat, your occupational exposure, environmental levels and the number of amalgam fillings you have. Health Canada estimates that for the average Canadian adult 20 to 59 years old the amount of mercury absorbed by the body from all sources is about nine millionths of a gram per day. Of this total dental amalgam is estimated to contribute about three millionths of a gram per day.