No. Zoom treatment cannot whiten any foreign material. It is designed to whiten only tooth enamel. It is better to whiten your teeth before having a cavity filled so you can match that dental work to the new shade of your teeth. The same goes for a crown. You want to get a crown that blends with the color of your newly whitened teeth. If you are due to have a cavity filled, a crown put on or any other dental work performed, talk to your dentist about your interest in the Zoom whitening procedure.