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laurenascough
Tooth fillings are often made of gold or porcelain because these materials are
 nonreactive means that they don't corrode or rust and they are resistible to staining
Their  thermal conductibility is low

chemically similar to teeth
Jaylin57dx
they do not rust or corrode and they don't have led in them. Porcelain and gold are also used because they have a high stain resistance.