What is the direct answer?
To whiten teeth while protecting enamel, use a dentist-assessed peroxide treatment or a regulated home tray and follow its directions.
What does this question mean?
Peroxide whitening changes the colour of dentine through the enamel, but excessive concentration, prolonged contact, acidic products, or abrasive powders can irritate gums or wear the surface.
What can you do next?
Have decay, cracks, leaking fillings, and gum recession checked first; a clinician can select carbamide or hydrogen peroxide strength and fit a tray so gel contacts teeth rather than soft tissue.
When should you seek dental care?
Use fluoride toothpaste, avoid brushing immediately after acidic drinks, and stop whitening if sharp pain, gum burns, or persistent sensitivity develops.
What should you ask the dentist?
Ask which discolouration is present, whether fillings or crowns will change colour, and what concentration, wear time, and sensitivity plan apply.
Frequently asked questions
Do whitening toothpastes bleach teeth?
Most remove surface stain with mild abrasives; they do not whiten the inner tooth colour like peroxide does.
Can enamel grow back after whitening?
Enamel does not regenerate like skin, so avoid unprescribed abrasive or acidic methods and use a professionally selected product.

