Can you find the filling in this tooth? Tooth-colored fillings, also known as composites, are made of plastic or glass polymers. The material bonds to the actual tooth structure helping to fill the cavity and make the tooth stronger for many years. They can be used to fill any cavity in the front or back, and we work with you to find the perfect shade that matches the color of your natural teeth. When finished, the filling will blend in with your natural teeth helping to maintain your beautiful smile!