A composite tooth filling, typically made of powdered glass and acrylic resin, offers a few advantages over an amalgam filling. For one, the filling can be shaded to match the color of a person's existing teeth, making it much less visible. As more people want natural-looking smiles, composite fillings have become increasingly popular.
Nonetheless, this type of filling isn't always the right pick. The material it's made from is less durable than a mix of metals, such as in amalgam, according to Thomas P. Connelly, DDS. Therefore, the useful life of a composite filing isn't always as long as other options. It's perfect as a small filling, and best suited for teeth that experience a moderate amount of pressure when chewing, compared to teeth that handle the bulk of your chewing action.