Dental question about taxonomy:treatment:teeth-whitening
Teeth whitening lightens natural tooth enamel and dentin, but it does not change fillings, crowns, veneers, or the cause of deep stains.
The short answer
Teeth whitening lightens natural tooth enamel and dentin by using a peroxide gel, but it does not change the color of fillings, crowns, or veneers.
What is the direct answer?
What does this question mean?
Whitening is a chemical process, not a layer of paint placed on the tooth. Hydrogen peroxide or carbamide peroxide breaks down stain molecules within enamel and dentin; surface stains from tobacco, tea, coffee, or food may respond more readily than discoloration from trauma, fluorosis, or medication.
What can you do next?
A dental examination can check for decay, leaking restorations, gum irritation, and exposed root surfaces before whitening. A dentist may use custom trays with a prescribed gel or apply a professional gel after protecting the gums, and can treat sensitivity with shorter applications or a lower-strength product.
When should you seek dental care?
Arrange an examination before whitening if one tooth is suddenly dark, if you have tooth pain, untreated cavities, cracked enamel, or bleeding gums. Stop a whitening product and seek dental advice if burning gum pain, marked sensitivity, or a persistent change in the mouth develops.
What should you ask the dentist?
Ask which type of discoloration you have, whether every visible tooth is natural enamel, and which whitening method fits your enamel and gums. Also ask how existing restorations will be matched afterward and what to do if sensitivity occurs.
Frequently asked questions
Will whitening remove a cavity stain?
No. A cavity needs diagnosis and treatment; whitening does not rebuild or disinfect decayed tooth structure.
Why did one tooth stay darker?
A tooth may have internal discoloration from trauma, previous dental treatment, or changes inside the dentin, which surface whitening may not correct.