Teeth can become so decayed and weakened by cavities and other factors contributing to poor dental hygiene that a crown is the best solution. A crown is a cap, typically made of porcelain often combined with metal, that fits on top of the tooth to reinforce it and replace the eating surface. It feels natural and has the same strong bite as your teeth. Whether you have a root canal or significant decay, the crown goes over the remaining portion of the tooth, which is shaped for the crown to fit so that you can enjoy a fully restored smile and bite.