Smile teeth whitening gel
Whitening gel uses peroxide to break down some tooth-colour molecules, but it cannot whiten fillings, crowns, veneers, or internal stains.
The short answer
Whitening gels commonly contain hydrogen peroxide or carbamide peroxide. These compounds pass through enamel and dentine and oxidise coloured molecules, while the tray or application system controls contact with the teeth and nearby gum tissue.
What is the direct answer?
What does this question mean?
A dentist should check for decay, gum inflammation, cracks, exposed roots, and leaking restorations before whitening. Use the specified gel concentration, tray fit, contact time, and course, and stop if marked sensitivity or gum irritation develops.
What can you do next?
Professional care may include cleaning surface deposits, treating disease, making a fitted tray, selecting a gel, and reviewing shade changes. Existing restorations may need separate colour planning because whitening changes tooth tissue, not restorative material.
When should you seek dental care?
Seek care before whitening if you have pain, untreated cavities, bleeding gums, enamel defects, pregnancy-related questions, or pronounced sensitivity. Contact the clinic for persistent sensitivity, burns, or uneven colour after treatment.
What should you ask the dentist?
Will whitening gel whiten a crown? No. Crowns and other restorations do not change colour in the same way as natural enamel.
Why do teeth become sensitive? Peroxide can temporarily affect fluid movement through dentine, especially when enamel is thin or roots are exposed.
Frequently asked questions
Will whitening gel whiten a crown? No. Crowns and other restorations do not change colour in the same way as natural enamel.
Why do teeth become sensitive? Peroxide can temporarily affect fluid movement through dentine, especially when enamel is thin or roots are exposed.
When should I arrange an examination?
Seek care before whitening if you have pain, untreated cavities, bleeding gums, enamel defects, pregnancy-related questions, or pronounced sensitivity.