My veneer just popped out while eating. It's one piece. Could it be reattached? (Photo)

If your veneer came off do not panic, store your veneer in safe container, call your dentist to be bonded to your tooth. The most important question is to find out why it came off? Was the tooth over prepared, not much enamel left?, the bonding solution was not good?, the protocol to bond the veneer to your tooth was not followed properly?These are the questions that your cosmetic dentist or dentist can advise you.Normally the veneers should not come off period.

When properly placed, veneers can last for decades!
On rare occasion due to trauma or while eating, a veneer may pop off. Don't panic! In most cases if the veneer is not damaged, your dentist can disinfect your tooth and re-bond it.
The sooner you can get in to your dentist the better, as teeth have a tendency to move.
I would avoid eating on this tooth and put the veneer in a safe place.

If the Veneer is in one piece , please take it to the Cosmetic Dentist he shall clean the inner surface of the veneer with a alcohol based solvent and add new bonding cement and refix it back .
Keep smiling 

good news is that , its in one piece. but show it to yr dentist to check any kind of crack or damage. visit dentist as soon as possible , else micro movement will also create issue with recementation. 

Please head to a dentist ASAP and make sure the inside of the veneer is thoroughly cleaned.  If there is any residue, it may not bond well to the tooth.  Here are the suggestions for the best possible adhesion:  the dentist should gently clean any residual cement and debris inside the veneer.  This can be done with a hand instrument and very light air abrasion.  I would then suggest scrubbing the inside of the veneer with a product called Ivoclean, rinse and dry, followed by applying a porcelain silanating agent or primer.  The tooth should be cleaned and "pumiced", followed by direct air abrasion, phosphoric acid etch, GLUMA, a universal bonding agent which is thin ("low film thickness"), and finally a good light cure cement with a solid curing light which will polymerize the cement.  I will stress that all of this should be done with that tooth isolated from the rest of the mouth, and without the presence of saliva.  Otherwise it will hinder the chemistry of the cement.  After the veneer is permanently seated, make sure the dentist checks your bite and to eliminate any interferences so that it does not come out again.  Hope this helps, good luck!

Chances are if there is not an issue it can be cleaned and rebonded. I suggest you go back to the doctor who placed them. Good luck!

Hi:Normally if the veneer is not damaged, it can easily be recemented.  Please go to a dentist right away to recement the veneer before any tooth movement occurs.Best,Dr. Maddahi

Yes- as long as the tooth structure is sound (no sign of decay, chips, etc), then cleaning and re-cementing the veneer should be routine and simple. Hope this helps!

Yes, you should be able to have a dentist clean any remaining bonding cement off of your tooth and veneer and then re-bond the veneer to the tooth.