Dental crowns, or dental caps, are a type of restorative treatment recommended when your teeth have sustained damage or decay. A crown is designed to fit over the entire visible portion of the tooth in order to restore its original shape and size and protect it from further damage. Crowns may be made of several different materials, but the most popular type of dental crowns are made of porcelain due to the fact that it matches the appearance and durability of your original tooth.