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.
Composite fillings are more difficult to place than silver fillings so may take your dentist 15-20 minutes longer to complete. Cosmetically they are superior to other fillings and are long lasting as well.
The main advantage of composite fillings is their aesthetic appeal. 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.