Peroxide for whitening teeth
Peroxide can lighten some tooth stains, but concentration, contact time, gum health, and the type of stain determine the risks and result.
The short answer
Peroxide whitening works by oxidizing some molecules that discolor enamel, but unmeasured household use can irritate gums and increase tooth sensitivity.
What is the direct answer?
What does this question mean?
Hydrogen peroxide and carbamide peroxide release reactive oxygen that changes some stain molecules within enamel and dentin. They do not bleach fillings, crowns, veneers, or bonding, so these restorations may not match after natural teeth lighten.
What can you do next?
Have the teeth examined and cleaned before choosing whitening, then use a dentist-supplied tray or in-office system exactly as directed. Stop and contact the practice if burning gum pain, marked sensitivity, or soft-tissue whitening persists.
When should you seek dental care?
Arrange an examination before whitening if you have cavities, cracked teeth, gum inflammation, exposed roots, or existing restorations in the smile line. Seek prompt care for swelling, severe pain, or a chemical burn rather than applying more peroxide.
What should you ask the dentist?
Ask which stain type is present, what peroxide formulation and concentration will be used, and how the gums will be protected. Also ask whether crowns, fillings, or veneers will need replacement for a uniform shade.
Frequently asked questions
Can peroxide whiten a crown?
No. Peroxide may lighten nearby natural teeth, but a crown keeps its manufactured shade.
Why do my gums turn white during whitening?
A concentrated product or poor tray fit may irritate the gum surface; remove it, rinse, and contact the dental practice if the area remains painful.