How long does teeth whitening at dentist last
Dentist whitening fades gradually as teeth contact staining foods and drinks, while touch-up care depends on the cause of discoloration.
The short answer
Dentist whitening is not permanent: the result gradually fades as new stain accumulates and tooth colour naturally changes.
What is the direct answer?
What does this question mean?
Professional whitening uses a peroxide gel to oxidise coloured molecules within enamel and dentine. Surface stains respond differently from colour changes caused by decay, trauma, medication or a restoration, which whitening cannot recolour.
What can you do next?
Before whitening, have the dentist check cavities, cracked teeth, gum recession and existing fillings or crowns. Follow the prescribed gel and tray instructions, clean between teeth and reduce repeated exposure to staining drinks if they affect your result.
When should you seek dental care?
Seek an examination for sharp sensitivity, gum burning, uneven colour, a dark single tooth or whitening that does not change the area you expected. Pain, swelling or a cavity should be assessed before cosmetic treatment.
What should you ask the dentist?
Ask what caused the discolouration, whether fillings or crowns will mismatch after whitening and which maintenance method suits your teeth. Ask how sensitivity will be managed and when a review is needed.
Frequently asked questions
Can whitening last forever?
No; maintenance may be needed because teeth continue to encounter foods, drinks and other sources of stain.
Why is one tooth still dark?
A single dark tooth can have internal discolouration or a non-vital pulp and needs dental assessment rather than repeated bleaching.