All-ceramic teeth in incisors may feel thicker on the inside when they are done, which is normal and can usually be accommodated. The strength of all-ceramic is not as strong as metal, so generally the thickness of all-ceramic crowns will be higher than porcelain teeth, and then higher than metal crowns. Therefore, the tooth preparation requirements for making all-ceramic teeth are very high, to ensure uniform thickness, and the amount of tooth abrasion is more than the porcelain crowns and metal crowns. If it is a living pulp tooth with a pulp chamber present, then the lingual side may be concerned with tooth preparation grinding into the pulp chamber. Even in the case of a dead pulp tooth, too much grinding can result in too little remaining tooth tissue. The labial aspect involves aesthetics and needs to be coordinated with neighboring teeth. Lingual surfaces are not aesthetically pleasing, so they may be made a little thicker than normal. This is normal and can usually be accommodated.