If you are happy with your original crowns and it is your natural teeth that have darkened then whitening will lighten your own teeth back to the colour when you were younger . Care should be taken as the porcelain will not whiten , and so if you over whiten your natural teeth then they will be lighter than the porcelain.
If you want to achieve a shade lighter than the original crowns then the whitening can be completed to the lightest shade possible and the crowns then replaced to match this shade .
If changes other than colour are desired , such as to the shape and arrangement of your other teeth , porcelain veneers may be worth considering.
I would advise a consultation with either your own dentist (or with a new dentist if your own dentist will not address these concerns) to discuss all these matters . A full set of pictures and x-rays should be taken as part of this consultation process and then a treatment plan agreed which addresses your concerns and wishes.
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Dr David Bloom BDS
Past president of British Academy of Cosmetic Dentistry
BACD Accredited dentist
Senova Dental Studios
High Quality Cosmetic & General Dentistry Watford
www.senovadental.com
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