Also known as "caps," crowns are used to cover and protect teeth. The indications for crowns include teeth weakened by extensive decay or fractures, large, failing fillings, and teeth treated with root canals. Crowns can also improve the appearance of broken or misshapen teeth. Crowns are made from various materials, depending on the particular need. Porcelain, porcelain fused to metal, and full metal are options. Porcelain fused to metal crowns are often used due to their strength and cosmetic appearance of the porcelain. Your dentist will discuss the advantages of each type and choose which type is best for you.