Composite fillings are made of a resin that is made to match the color of your teeth. The resin is used to fill in any holes, cracks, or indentations in the tooth itself.
This type of filling will not stick out, unlike other restorations such as porcelain inlays, metallic fillings, or other dental amalgam. Instead, the composite fillings will blend almost seamlessly with the rest of your teeth. You may hear them under other names such as tooth-colored fillings or white fillings.
The resin itself is a combination of acrylic materials. This gives the resin strength when it hardens. Small amounts of metal are added to give the right color to the tooth. Trace amounts of titanium and zirconium are then added to make your tooth opaque.