Is it possible to remove stains on porcelain crowns?

Stains on porcelain veneers and crowns is best removed by your dentist, and not by over counter products. Extrinsic stains are easily removed and polished by diamond paste, using airflow can also help! Intrinsic stains require redo of your veneer, such as decay or black spot due to blood clot! The other important factor is the type of porcelain was used for your crown, veneer or the bridge!Best of luck 

Minor surface stains can be easily removed by polishing porcelain during routine professional dental cleaning. It may be necessary to replace the damage to porcelain that cannot be repaired.

Hi:You can use Luminuex Oral Essentials whitening strips on your crowns to remove external staining.Best,Dr. Maddahi

A good polishing at your dentist should be able to remove the stains. Pumice and or porcelain polish should work and keep them smooth.

Hello

The best option to get a clean crown is change it. But you can consider do a cleaning at least every 4 months because you are smoker and you drink so much coffee. 

Sometimes dentists will polished or grind off stains on the porcelain BUT you’ll be doing it at your own risk as grinding on porcelain will weaken them and they may crack. Be ready for new ones.