I have had porcelin crowns done 3 yrs ago,but they now look like the shiny surface has been scratched afew times,so now they dont look as shiny as they did when i first got them, is there a way to polish them and have them look as shiny as they did? what does the lab use to polish porcelin? can i have that same polishing done while they are attached to my teeth? or do they have to be heated to look shiny? Thank you
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