Amalgam fillings are silver coloured. They are made by combining mercury and a silver alloy (50% mercury, 35% silver, and 15% tin, copper and other metals). Amalgam is long lasting and hard wearing and has been used in fillings for at least 150 years. It is economical to use and it is not unusual for an amalgam filling to last for over 10-12 years.
This kind of filling is usually used on the back 'chewing' teeth. Before the filling can be placed, we must prepare the area by removing all the decay and shaping the cavity to hold the filling in place.