How to safely bleach teeth

Teeth bleaching uses peroxide to break down stains; choose a method after checking enamel, gums, fillings, and sensitivity.

Hydrogen peroxide or carbamide peroxide can diffuse through enamel to oxidize colored compounds, but it does not whiten crowns, fillings, or veneers.

The clinical question is whether the symptom fits the named product, treatment, or injury, or whether another dental condition explains it.

The exact cause depends on the tissue involved, the timing of symptoms, and whether there is visible damage or inflammation.

Have the cause of discoloration assessed, use a dentist-directed tray or a labeled product exactly as instructed, and keep gel off the gums.

Use only measures suited to the tissue and stop any step that causes sharp pain, chemical burning, or worsening swelling.

Get dental advice before bleaching if you have cavities, cracks, gum disease, exposed roots, severe sensitivity, or extensive restorations.

Prompt assessment matters when symptoms affect eating, sleep, breathing, swallowing, or normal tooth function.

Why might bleaching make teeth sensitive?

Ask what was examined, which finding explains the symptom, what treatment is indicated, and what change should trigger an earlier review.