Cleo,

Composite fillings on posterior teeth should last 10+ years, even longer if the patients bite is in proper alignment. The only time they would need to be changed is if the tooth developed additional decay or the filling broke for some reason or they wore down due to a bruxing habit. Otherwise they are very durable, less toxic than mercury fillings and they actually bond with the tooth.

May I ask, what gave you the impression that these restorations had such a short life span?

Bryanna