First off if an adult tooth gets loose you should see a dentist.
Ceramic tooth fell out.
Most crowns are made from ceramic material in some cases fused to metal.
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.
It s important to see your dentist as quickly as possible if you have a problem with your crown or if it fell out.
Once decay happens inside of your mouth and on your crown your cosmetic dentist will no longer be able to reuse your crown which will eventually cost you more money in the long run.
Reasons include decaying of the underlying tooth and loosening of the cementing material used to place the crown.
Some patients opt for long lasting crowns made of gold or other strong metals but many patients prefer ceramic material because it can be made to look like neighboring teeth.
Sometimes crowns fall off.
Porcelain crowns are particularly common and as they age many do become loose and fall out.
Second if you chose to ignore this and your adult tooth falls out you should go to a dentist immediately.