Crest 3d white professional effects instructions
Use whitening strips only as directed because peroxide can cause sensitivity and gum irritation.
The short answer
Whitening strips use a peroxide gel held against the enamel for a specified contact time; follow the product instructions rather than extending the wear time. They lighten some tooth stains, but they do not whiten fillings, crowns, or veneers.
How does peroxide break down coloured tooth molecules?
The peroxide diffuses through enamel and dentine and breaks down coloured molecules. Results and sensitivity depend on peroxide concentration, contact time, enamel condition, exposed root surfaces, and the original stain.
How can you fit and use whitening strips safely?
Check the strip fits the teeth, keep gel off the gums, and stop if significant irritation or sharp sensitivity develops. A dental examination should come first when there is decay, cracked enamel, gum recession, or uncertain staining.
When do whitening symptoms need dental care?
Seek dental care for persistent sensitivity, gum burns, uneven colour, pain, or darkening in one tooth. A dentist should assess untreated decay, restorations, pregnancy, and other factors before recommending whitening.
What should you ask about stains, restorations, and sensitivity?
Ask what caused the staining, whether your restorations will change colour, which regimen suits your enamel, and how to manage sensitivity.
Frequently asked questions
Could this have more than one cause?
The peroxide diffuses through enamel and dentine and breaks down coloured molecules. Results and sensitivity depend on peroxide concentration, contact time, enamel condition, exposed root surfaces, and the original stain.
What should you do first when applying the whitening strip?
Check the strip fits the teeth, keep gel off the gums, and stop if significant irritation or sharp sensitivity develops. A dental examination should come first when there is decay, cracked enamel, gum recession, or uncertain staining.
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.