Porcelain crowns are particularly common and as they age many do become loose and fall out.
Ceramic tooth fell out.
Reasons include decaying of the underlying tooth and loosening of the cementing material used to place the crown.
Sometimes crowns fall off.
Most crowns are made from ceramic material in some cases fused to metal.
Dental patients often tend to swallow a temporary crown since the adhesive used to hold it in place is more likely to fail and the crown may be dislodged while chewing a mouthful of food and swallowed before you know it s missing.
The longer you wait for your crown to be out of your mouth the higher the chance your mouth has of multiplying tons of bacteria which will then lead to decay.
Second if you chose to ignore this and your adult tooth falls out you should go to a dentist immediately.
First off if an adult tooth gets loose you should see a dentist.
This is because your dentist can refit it before the underlying tooth becomes further damaged or decayed.
Third if for some reason your tooth cannot be replaced or you refrain from going to the dentist entirely at the time of the event you should still go to see a dentist.