How Long Do Crest Strips Last?
Crest 3D Whitestrips brighten natural teeth temporarily, but results fade as stains build; learn what affects fading and when to seek dental advice.
The short answer
Crest 3D Whitestrips whiten natural tooth enamel temporarily, and the result fades as new stains from food, drinks, tobacco, or plaque build up. The duration varies with the starting shade, diet, smoking, and the product course used.
How does the peroxide gel in whitening strips work?
The strips contain a peroxide whitening gel held against the front surfaces of the teeth. It can lighten surface and some deeper enamel stains, but it cannot change the colour of fillings, crowns, veneers, or other restorations.
How should you use whitening strips according to the package?
Follow the exact wear time and course printed on your box, and keep the gel off the gums. Reduce frequent exposure to coffee, tea, red wine, tobacco, and strongly coloured foods, and brush gently with fluoride toothpaste.
When should whitening side effects be checked by a dentist?
Arrange an examination if whitening causes persistent sensitivity, gum irritation, pain, or an uneven result. A dentist should also check darkening around one tooth, untreated decay, cracks, or gum disease before further whitening.
Will whitening match your restorations and suit your gums?
Ask whether the colour change is surface stain or an internal tooth change, whether existing restorations will match, and which whitening concentration and schedule fit your enamel and gums.
Frequently asked questions
Can I repeat a whitening course when teeth darken?
Only follow the product schedule or a dentist's plan; repeated use can worsen sensitivity or gum irritation.
Why are my teeth uneven after strips?
Natural enamel and restorations respond differently, and pre-existing stains may not be uniform.
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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.