It is completely safe to whiten veneers, crowns & fillings. The process will not jeopardise their integrity. Unfortunately they do not whiten at the same rate as natural teeth. For this reason we are unable to guarantee results on them. However, we have had amazing results with some of our clients achieving upto 12 shades whiter. On average customers achieve between 2 and 8 shades on veneers, crowns and fillings. Please note they will not whiten brighter than their installation shade.