Do porcelain veneer teeth stain like real teeth over time?

Someone wrote a good answer to this question at the Cosmetic Dentistry Central forum;

No. Over time they can stain slightly but it would take years and years and even then they would not stain as easily as real teeth. They have a glaze on them so sort of like a porcelain sink the stains should not penetrate them. When you get cleanings that can usually lift out very light surface stains. They don't respond to bleaching or Zoom whitening.