Hello. Thank you for your advice. One of my porcelain veneers fell off this weekend. My dentist was out of town so I went to another recommended by his office and had it re-cemented on. The dentist used a cement called panavia and I now see a really slight color difference between this one and the others. Its a pretty slight difference but I am wondering if it is possible to have it removed and replaced again by the dentist who did them the first time to match more closely. Thank you!