What is the direct answer?
In-office whitening uses a professionally selected peroxide gel, with examination and soft-tissue protection before treatment begins.
What does this question mean?
Peroxide breaks down stain molecules in natural enamel and dentine. Crowns, veneers, fillings, and bonding do not whiten in the same way.
What can you do next?
The clinician checks for decay, cracks, gum inflammation, exposed roots, and restorations, then isolates soft tissue and applies the gel in monitored stages.
When should you seek dental care?
Seek an examination before whitening if you have toothache, untreated decay, gum disease, or unexplained darkening of one tooth.
What should you ask the dentist?
Ask what is causing the symptom, which examination or imaging is needed, and which treatment options address that cause.
Frequently asked questions
What should I know about this problem?
Peroxide breaks down stain molecules in natural enamel and dentine. Crowns, veneers, fillings, and bonding do not whiten in the same way.
What is the next practical step?
The clinician checks for decay, cracks, gum inflammation, exposed roots, and restorations, then isolates soft tissue and applies the gel in monitored stages.

