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Professional tooth whitening lightens natural tooth enamel by breaking down stain molecules, but it does not change fillings or crowns.
The short answer
Professional whitening uses peroxide gel to break down stain molecules in natural enamel; its result does not change the color of fillings, crowns, or veneers.
What is the direct answer?
What does this question mean?
A whitening appointment usually involves checking the teeth and gums, protecting soft tissues, and applying a measured hydrogen peroxide or carbamide peroxide gel. A light may be used with some systems, but the gel's chemical action is what breaks down many stains.
What can you do next?
Have the dentist identify whether the discoloration is on the surface or within the tooth before choosing treatment. Treat cavities, gum inflammation, exposed root surfaces, or leaking restorations first, and follow the prescribed gel time rather than adding extra applications.
When should you seek dental care?
Arrange an examination if whitening causes persistent sensitivity, gum burning, uneven color, or pain from one tooth. A darkened single tooth can have pulp or trauma-related changes that whitening alone will not diagnose.
What should you ask the dentist?
Ask which teeth are suitable for whitening, whether existing restorations will need color matching, and how the gel will be isolated from the gums. Also ask what concentration and contact time are planned for your enamel and sensitivity history.
Frequently asked questions
Does whitening remove enamel?
The intended action is to change stain molecules within or on enamel, not to remove enamel, but suitability and irritation risks depend on the product and your teeth.
Will a whitening light make teeth whiter?
A light is used with some systems, while the peroxide gel performs the main stain-breaking action.