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"But the crowns have aged / yellowed too..
Thats what I dont get.. They were the same color.. They are now the same color..
Maybee the crowns bleach more or less fast than the teeth creating a mis match ??"
Yes but when you get new white collor on teeth by using gel,your teeth get very very white.
Your old crown,fillings will only go back to what it was when new,not so white as your new teeth will be.
Gel canot change collor on fillings,crowns.
The collor of fillings,crowns was made to adjust the collor of your teeth at that time you made them many years ago.
That is why the dentist want to change fillings before bleaching,spesially in front
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