The majority of the treatments available for teeth whitening are suitable only for natural teeth. Most bleaching agents only work on natural tooth enamel and not on artificial materials. In fact, teeth bleaching chemicals can damage bonding, veneers or crowns.
It is possible that bonding, veneers, or crowns can accumulate extrinsic stains. This can be removed through a whitening treatment made specfically for this reason.
However, in some cases it is possible to make a veneer look whiter through instrinsic stain whitening. Since a veneer only covers the front of a tooth, bleaching agents can access the natural tooth structure from behind. By whitening the underlying dentin, the veneer may show more brightness. Today, new methods of bleaching, like deep bleaching, are making progress in the ability to whiten underlying dentin.