Crowns are prescribed when a tooth or teeth are too badly decayed, broken or cracked to be easily restored with a filling. Crowns are normally needed for teeth that have had root canals. Crowns are also placed on dental implants to replace missing teeth. Crowns can be made without a metal core like our Emax and Procera all-ceramic crowns, which provide strength and beauty for years to come and don’t show a gray line near your gums.