I have root canal treated crowns for my front teeth. There are metallic crowns and coated with ceramic. Now that the dentist asked me to go for scaling for every 6 months, i want to know whether scaling can be done on ceramic coated crowns. I have a fear that if scaling is done to ceramic coated crowns, the ceramic coat on crowns may vanish and and metal will be displayed. Please clarify my doubts. Thank you.