In some patients with a fractured tooth, the structure of the tooth is compromised enough that it results in weakening of the tooth itself. In these patients, it is reasonable to consider placing an artificial crown on the tooth. In human dentistry, crowns are often necessary after root canal therapy. However, in veterinary dentistry, crowns are optional. In certain circumstances, crowns are highly recommended in order to reduce potential for re-fracture of the treated tooth in the future. In dogs, the crown is typically made of a hypoallergenic metal alloy, and is silver in color.