Crest 3d strips before and after
Whitening strips can lighten some surface and internal stains, but results vary with stain type, tooth color, fit, and whether restorations are present.
The short answer
Whitening strips use a peroxide gel to lighten some natural tooth stains, but the visible change depends on the stain, exposure pattern, tooth color, and existing restorations.
What is the direct answer?
What does this question mean?
Whitening strips are flexible carriers coated with a peroxide-based gel that contacts the outer enamel surface. The active compound diffuses into enamel and dentin and can break down some stain molecules, but it does not whiten fillings, crowns, veneers, or bonding.
What can you do next?
Follow the product directions and keep the strip on the teeth it is designed to cover, avoiding the gums. Stop if marked sensitivity or gum irritation occurs, and have dark single-tooth discoloration or cavities assessed before whitening.
When should you seek dental care?
Ask for an examination before whitening if you have decay, cracked enamel, gum recession, untreated sensitivity, or a restoration in the visible area. Seek care for pain, a persistent white or brown patch, or uneven color that does not match normal surface staining.
What should you ask the dentist?
Ask whether the discoloration is external or internal, whether the teeth and gums are healthy enough for whitening, and how existing restorations will appear afterward. Ask which concentration and application pattern fit your teeth.
Frequently asked questions
Will strips whiten one dark tooth?
A single dark tooth may have internal discoloration or previous trauma and should be assessed before using a general strip product.
Why can strips make teeth sensitive?
Peroxide can temporarily move through enamel and dentin and irritate the pulp or exposed root surfaces.