If the bonding agent is loose or the teeth themselves are decayed, the teeth inside may rot, usually the teeth inside the all-porcelain braces will not have problems. 1. Loose bonding agent. All-porcelain braces with a layer of adhesive between the natural teeth, with the use of time to extend the adhesive may occur loosening, the outside world of food, saliva, bacteria will enter the crown and teeth in contact with the teeth, with the passage of time the teeth will appear caries. 2. The tooth itself has caries. Before wearing all-ceramic dental crowns, the teeth jaw deeper fossa may have mild caries or the original filling of the teeth within the secondary caries. All-ceramic teeth within the set of teeth generally do not occur caries, but if you suspect that there is caries, you need to go to the hospital to check the consideration of the removal of the crown treatment.