When it comes to filling a cavity, a couple of different materials can be used. One of the most commonly used materials is tooth-colored composite fillings. These come in a variety of shades to match the color of the surrounding teeth. Research suggests that this type of filling can last the same amount of time as other fillings (may or may not last as long as older types of fillings, though).
The Difference Between Composite and Amalgam (silver) Fillings
Composite fillings cost a bit more than silver fillings because they require a skilled dentist to place them. They are more expensive because you don’t lose as much tooth structure as silver fillings, and they look more natural.
Both types seal the tooth and last about the same amount of time. Silver fillings don’t seal as well at first but spread out and harden, creating a better seal as time goes on. Both types may cause tooth sensitivity after filling, which may last a few days to a few months.