Peroxide and teeth
Peroxide and teeth require care because peroxide can oxidise stain molecules but can also irritate gums and increase sensitivity when the product.
The short answer
Peroxide is used in controlled dental whitening products, but the word covers different concentrations and formulations. A product for oral use is not interchangeable with household hydrogen peroxide, and neither removes tartar or repairs damaged tooth structure.
How does peroxide change the colour of teeth?
During whitening, peroxide molecules can pass through enamel and dentine and react with coloured compounds. The same oxidising activity can irritate the pulp or oral mucosa, especially when enamel is worn, roots are exposed, trays leak onto gums, or treatment is overused.
What should you do before using peroxide whitening?
Have the cause of discoloration checked before whitening, then use only a product and schedule intended for the mouth. A clinician may treat tartar, decay, gum disease, or defective restorations first and can protect the gums while selecting a whitening method.
When should peroxide whitening be checked by a dentist?
Stop and obtain advice for sharp or persistent sensitivity, gum burning, white tissue, peeling, or pain. Do not swallow peroxide, and seek urgent medical help for significant ingestion or breathing difficulty.
What should you ask about the cause of tooth discolouration?
Ask whether the colour is surface stain, enamel change, fluorosis, medication-related, or a restoration that will not whiten. Ask about concentration, tray fit, exposure time, sensitivity management, and alternatives.
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Who wrote this page
This library is published by Dental Nation, a licensed dental group practising in the United Arab Emirates. Pages are written and overseen by the same clinical team that treats patients in our clinics, and are held to a fixed editorial standard for safety and accuracy.
This page is patient education, not medical advice, and cannot replace an examination. Anything urgent — facial swelling, trauma, uncontrolled bleeding or severe pain — needs a dentist or emergency care now.