A crown is a type of cap that completely covers a real tooth. It's made from either metal, or porcelain and metal, and is fixed in your mouth. Crowns can be fitted where a tooth has broken, decayed or been damaged, or just to make a tooth look better.
To make a crown, the old tooth will need to be drilled down so it's like a small peg , an impression is then taken and sent to the laboratory where the crown is made. Once the crown has been returned from the laboratory it is then cemented onto the tooth.