Sometimes teeth are too badly decayed or fractured to be fixed with a filling. A crown becomes the best option of repair to maintain the tooth in your mouth long term. The type of crown a dentist places in your mouth makes a difference in your smile’s appearance. All porcelain crowns don’t contain any of the metal which historically is responsible for giving that dark line along the gums. All porcelain crowns match the color, hue, and value of your natural teeth better than other types of crowns.