Composites are bonded directly to your tooth which can help to support the remaining tooth structure.
Composites can be used for a variety of cosmetic dental procedures –
Composite is not ideal for all restorations on back teeth especially if you have a large cavity, as bonding does not have the strength over large areas or if you have a heavy bite, grind or clench your teeth. The alternative tooth coloured restoration then would be an inlay/onlay.
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.