Amalgam (silver) fillings are made from an amalgamation of different metals and are silver in appearance. Amalgam fillings are resistant to wear; however, due to their colour they are more noticeable than composite fillings and are not usually used in very visible areas, such as front teeth. Amalgam fillings are the main type of filling provided through the NHS on back teeth - composite fillings are considered to be cosmetic and therefore often provided privately on back teeth.