Slice Prep Teeth to Close Triangles on Veneers then Transition to Crowns?

When doing veneers on central incisors to close "dark triangles" it is a great idea to slice prepare the teeth.  In the future, if you have the veneers replaced it will be fine to transition to full crowns, though it may not be necessary.  That decision would be made at the time of removing your existing veneers.  Hope this helps.

I usually prefer the esthetic results when contacts are broken.  If staining of the bonding cement stains it is kept out of site and there is less chance of losing a veneer.  Do not worry about future replacement because there is very limited tooth removal.

Esthetics are vitally important and contact breaking really helps improve them in almost all patients but are vitally important if correcting midline discrepancies.

Gingival recontouring is a frequently neglected step in cosmetic procedures that can make incredible changes in final esthetics

One advantage to having veneers is that later in life, if there is a need, there is adequate remaining tooth structure to have a crown (unless the tooth is broken at the gumline).  Crown contours, replacement veneers, or dermal fillers (like Juvederm) are usually the choices when closing black triangles near porcelain veneers.