Duane had two crowns that were over 15 years old with openings and recurrent decay. His crowns were also porcelain fused to metal which gave him an unappealing gray look around his gums. Dr Michaelson started treatment with Zoom in office whitening and replaced his existing crowns with 2 esthetic all porcelain crowns to match his shade. Duane's teeth now look so natural that you cannot tell he has crowns.