Zoom Whitening Work on Porcelain Veneers?

Are the 2 veneers already whiter then the adjacent teeth? If this is the case using the tray method of bleaching will allow you to control the final color and match the adjacent teeth to the veneers. If the teeth match the veneers and you want whiter teeth bleaching the adjacent teeth first then replacing the veneers would occur.

Whitening procedures will not whiten previous dental work such as bonding, crowns, and veneers. If your veneers currently perfectly match your teeth then whitening may not be a good idea.  However if the veneers are whiter than the rest of your dentition, then whitening is suggested.

Regards,

Peter Mann DDS

Hopefully, I have good news for you.
If you have veneers on your 2 front teeth and want to whiten your smile, you may be successful using custom trays. Place the gel in the trays normally (so that the gel will touch the front surface of the teeth) for all teeth except the 2 front teeth. Place the gel so that it will touch the back of the 2 front teeth.
Veneers cover the front of the teeth and your natural tooth surface is still exposed on the back. The gel will enter the tooth through the natural tooth surface and whiten from the inside-out. The whiter underlying tooth should make the veneers appear whiter as well. I prefer using custom trays for this procedure because you can take small steps and if the neighboring natural teeth begin to get too white, you can try whitening only the 2 front teeth for a while. With Zoom, you may end up with a more uneven result.