How does dental bonding compare to veneers when it comes to making teeth appear longer?

Crowns can correct more severe tooth discolouration than veneers because they can be made thicker without affecting how well the crown can stay on the tooth. Veneers should be bonded to mostly (or only) enamel for the best chance of long term success (the veneer not falling off or staining at the edges). To ensure that enamel remains after tooth preparation, only about 0. 5mm of tooth structure can be trimmed off.

Resin infiltration (ICON) is normally done to even out any white/brown/yellow spots on the enamel. These spots are areas of porous enamel. If these spots are not very significant and are shallow, then the process of trimming the enamel to accomodate the veneer will remove these areas of porous enamel and eliminate any colour discrepancy which may show through. If the spots are prominent and deep, then prior bleaching or use of ICON may not be effective and microabrasion of the enamel may be required prior to veneer placement.