• A crown is a tooth-shaped cover placed over a tooth that is badly damaged or decayed. Many people call it a cap. Crowns may be placed for several reasons. Usually, because the tooth has been broken or severely damanged by decay. As a result, a filling can't replace enough of the tooth or make the tooth strong enough. A crown may hold together parts of a cracked tooth. It can also be use to hold a bridge in place. Crowns can be used to improve appearance appearance as well. They may be placed to cover missphapen or badly discolored teeth.

    Crowns can be all metal,porcelain fused to metal (PFM), or all ceramic. Metals include gold alloy, other alloys (palladium) or a base-metal alloy (nickel or chromium). PFM and all-ceramic crowns are the same color as your natural teeth. Crowns usually last at least seven years. In many cases they last much longer, up to 40 years or so if you maintain a good oral health. Source: Colgate