Most people have fillings of one sort or another but today, because we are much more conscious of our smile, we can choose a natural looking alternative - the composite or tooth-coloured filling. A composite resin is a tooth-coloured plastic mixture filled with glass (silicon dioxide) first introduced in the 1960s. Originally only used for front teeth because of their softer nature, modern improvements to their composition make them generically suitable today. The main advantage of composite fillings is their aesthetic appeal. The main disadvantage is their life expectancy. White fillings have always been considered less long lasting than silver amalgam fillings but there are now new materials available with properties comparable to silver amalgam, and these are proving to be very successful. The life expectancy of your composite filling can depend on the depth of cavity and its position in the mouth; your dentist is best positioned to advise you. Tooth coloured fillings are only available on front teeth on an NHS basis.