10 Years Post Porcelain Veneers, Gaps Reappeared. What Do You Recommend?

The real question is "Why are the gaps reappearing?" It sounds as if your teeth are spreading apart. This usually is the result of a poor bite, or occlusion. Invisalign is a great way to pull the teeth back together, but make sure your dentist is experienced in occlusion, so that the gaps do not reappear again in a few years.

Teeth shift after veneers due to a reason. you need to see why you are having gaps appear int he first place. if the veneers are good enough, get some sort of orthodontic ( braces) opinion

The most important thing that should be identified- by the gaps are reappearing? It can be due to bone loss, that should be addressed by periodontist. Before you will jump into the decision to replace the veneers you should seek for a consult with the specialist like prosthodontist or periodontist.

Invisalign would be a fairly simple way to close the spaces, preserving the veneers.  Veneers can be redone, but if the gaps are large, the veneers may end up looking fat.  Both should be viable options.