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a) Amalgam Fillings use an alloy (mixture) of mercury and other metals (such as silver, copper or tin) that is carved and contoured after placement in the tooth.
b) Composite Fillings use a composite made of minute glass or ceramic particles that are mixed into a gel-like substance. The color of the substance is similar to that of a tooth. After it is applied to the tooth, the composite is hardened using a light that causes it to solidify almost instantly.