Dental crowns are covers or caps that fit over your natural teeth so as to protect and secure the remaining part of the tooth. They could be needed when a cavity is so large that a filling will not work, or because a tooth has been weakened significantly by tooth decay. The crown wraps around the whole natural tooth to help secure what remains of it.
All-ceramic or all-porcelain dental crowns provide better natural colour match than any other crown type and may be more suitable for people with metal allergies. However, they are not as strong as porcelain-fused-to-metal crowns and they wear down opposing teeth a little more than metal or resin crowns. All-ceramic crowns are a good choice for front teeth.