Teeth that have large cavities, large fillings, or have been cracked or worn severely may not be strong enough to support a new filling. A crown is then recommended that covers the tooth, and protects it from breaking. A crown is a two appointment process. Appointment #1 is to prepare the tooth for a crown by removing all old fillings, decay, and appropriate tooth to allow a strong crown to be made by the lab. You leave with a temporary crown. In 2-3 weeks, you return to receive your final crown. Often the second appointment is so easy that you do not require a shot. Dr. Bliss uses very strong white crown materials unless another material is requested.