Had a crown placed on a tooth in 2011 and it has already broken - the insurance company will not pay for a new one since it did not last as long as they expected. The doctor says his warranty is one year. I would need to pay for a new crown. No consideration given to help defray the cost of having it re-done so soon. I have other crowns and they have far exceeded 10 years. Before getting work done beware of your exposure to having to pay out of pocket if any problems occur between the dentist's warranty and your insurance company's expectations.