A little extra for your smile
Whitening strips: how they work and what to expect
A brighter smile starts with a little understanding. Know what strips can do, where comfort matters, and how whitening fits into your routine.
Editorial illustration. Not a customer or a treatment result.
The short answer
Peroxide whitening strips can lighten natural teeth. Results vary, and sensitivity or gum irritation can happen. Choose a treatment that fits your mouth, follow its directions, and ask your dentist about existing dental work or discomfort.
Surface stains and tooth color are different
Coffee, tea, wine, and tobacco can leave stains on the outside of teeth. Color changes can also happen within a tooth. The cause matters when choosing a whitening approach.
Whitening toothpastes mainly help remove surface stains. Peroxide bleaching changes colored compounds within teeth. Most whitening strips use hydrogen peroxide or carbamide peroxide to deliver that bleaching action.
Three approaches, different roles
| Option | What to know |
|---|---|
| Whitening toothpaste | Part of brushing, primarily for surface-stain removal. It is different from a dedicated bleaching treatment. |
| Whitening strips | An at-home bleaching option. Follow the specific product’s application time and treatment schedule. |
| Dentist-guided whitening | May use custom trays at home or treatment in the office. Your dentist can assess the cause of discoloration and plan around your teeth and restorations. |
Source: ADA: Whitening options and treatment considerations.
Set expectations before you start
Will strips whiten every tooth?
Whitening changes natural teeth. Crowns, veneers, and fillings do not lighten in the same way, so a color mismatch is possible. Different kinds of discoloration respond differently; your dentist can help you understand your likely result.
Can whitening cause sensitivity?
Yes. Tooth sensitivity and gum irritation can occur, even with products used as directed. Sensitivity is often temporary. Pause treatment if it becomes uncomfortable and ask your dentist how to proceed, especially if symptoms persist.
Does more time mean a better result?
Do not extend wear time or add extra sessions beyond the directions. Overusing whitening products can harm enamel or gums. A promise of zero sensitivity should not replace attention to how your mouth feels.
Sources: ADA MouthHealthy: Results and side effects; ADA: Whitening considerations.
Check the foundation first
Your dentist should check that your teeth and gums are healthy before whitening. Tell them about sensitivity, restorations, or a tooth that has changed color. Whitening is a cosmetic choice; it does not replace care for a dental problem.
Sources: NHS: Assessment before whitening; ADA MouthHealthy: Changes in tooth color.
How our current strips fit in
TWICE Whitening Strips contain hydrogen peroxide and coconut oil, with a mint finish. The current pack contains 20 treatments: 40 strips, with one upper and one lower strip per treatment.
- Peel with dry hands. Open one packet and remove the strips from their backing.
- Apply the gel side to teeth. Use the longer strip on top and the shorter strip below. Align at the gum edge, press gently, and fold over the teeth to secure.
- Wear for 30 minutes. Remove and discard the strips after the treatment.
- Brush away remaining gel. Follow the aftercare directions on your own pack.
Follow the treatment frequency on your own pack. Do not extend wear time or add extra sessions to chase faster results.
Source: TWICE Whitening Strips application guide and packaging images, checked September 18, 2026.
See Whitening Strips and directionsKeep your everyday care consistent
Whitening is an optional addition. Keep brushing and cleaning between your teeth, and choose a routine you can maintain. A shade change is one part of how a smile looks, not a complete picture of oral health.