Porcelain veneer not wrapped to the back properly

See your dentist or cosmetic dentist, so he or she can explain the reason why this particular tooth is not covered like the other veneers, or possibly the wrap was broken. If your veneer was properly prepared and the veneer is bonded to your enamel, you have nothing to worry about, it will not fall off. If there is rough edge bothering your tongue, the dentist can add dental composite to the back, depending on the situation, or polish it off. It is best to address this as soon as possible, since if you got emax veneers vs  regular porcelain veneers, that is rough, this can cause wear to your opposing tooth.

This may or may not be an issue.  If this veneer is done correctly, then you may just need some extra cement removed from that area.  However, if your veneered tooth is in fact under-prepped, you may need your dentist to remove it, re-prep the tooth, then place a new veneer.  It is most likely the first scenario that I presented, but either way, just visit the dentist that did your veneers and ask him or her to simply check the veneer and express your concerns.   I hope this helps.Dr. Sarah Thompson

Hi:It is difficult to give you accurate advice with out a photo of the area.  It's best to go back to your dentist and have him/her polish the sharp area.Best,Dr. Maddahi

Straight after getting veneers fitted is the time you will notice the smallest bump or angle change, sometimes it is a defect where the veneer is smaller than the preparation. Sometimes it is just excess cement that can be quickly rubbed off.
Occasionally, the communication between the dentist and the technician is poor, and the shape that was decided by the dentist was either impossible or ignored by the technician.
Fundamentally, you need to speak to your dentist. It is a good idea to check in front of a mirror to work out for yourself the position of the problem so you can explain it quickly. 
Good luck in getting your problem solved -
Kind regards
Thomas Dey, BDS, MSc