Dental crown Clarence Rockland is a restoration that is used to cover and protect a tooth that suffered extensive damage from decay, disease or injury. It is made of a durable ceramic material which can be tinted to perfectly match the colour of the surrounding teeth. Aside from looking very natural, a dental crown provides strength and protection from further damage or decay. The one important disadvantage of this restoration is the significant preparation (reduction in size) it requires. This modification of the natural tooth is permanent which means that the tooth will have to be covered and protected with the crown forever.