Can a Gap Between Veneers B Fixed?

Typically porcelain veneers are used to close gaps and hide spaces.

If you've had your teeth shift slightly after your veneers were done, then sometimes they can be moved slightly back into a tighter alignment. In this situation I work closely with my Orthodontist.

Most of the time there is not something that can be added to the porcelain to disguise the space. In rare cases there can be the right circumstances that some bonding could be done, but this is usually not the case.

If they used to fit tightly together and now there is a gap, then you will want to see your dentist right away to make sure it doesn't keep getting wider.

You could have a gum heath (periodontal disease) problem or a bite problem.

The only way to correct a gap between veneers, would be to replace the veneers or use invisalign to close the space.  You are unable to bond the space closed. 

It's hard to answer this without photos and a history. Are these brand new veneers? was the gap apparent the day the veneers were inserted? Did the gap develop months or years later? Do you have periodontal disease? How is your occlusion? etc, etc...

Veneers made of porcelain cannot be bonded to close the gap with a predictable long term result.  A veneer made of composite could be bonded to close the gap however, the result might not be very esthetic as the veneer was made to proper proportion in the first place.  In other words the veneer will look too wide and have that bugs bunny effect.