Whitening gel is genuinely effective — but only on the things it's designed to change. Knowing the difference up front is the best way to be happy with your results.
What whitening gel can do
- Lift everyday stains from coffee, tea, red wine, and tobacco that build up on natural enamel.
- Brighten natural tooth colour by several shades with consistent use.
- Refresh a dull smile caused by years of surface and deeper staining.
What whitening gel cannot do
- Change the colour of restorations. Crowns, veneers, fillings, and bonding don't respond to peroxide — they stay the shade they were made. If they were matched to darker teeth, whitening can make the contrast more noticeable.
- Fix internal discolouration overnight. Stains from old trauma, certain medications (like tetracycline), or fluorosis whiten slowly and unevenly, if at all.
- Make teeth "unnaturally" white in one use. Whitening is gradual and works within the limits of your natural enamel.
Setting the right expectation
Think of whitening as returning your teeth toward their brightest natural shade, not painting them a new colour. Most people see a clear, natural improvement within one to two weeks. Results last longer when you maintain them — a short top-up every few months keeps stains from creeping back.
If you have restorations
Whiten first, then match. If you're planning new crowns or veneers, whiten your natural teeth to your target shade before the restoration is made, so everything matches afterward. A dentist can guide the timing.
For adults 18 and over. Not suitable for use on crowns, veneers, or fillings. A first session under the guidance of a dental professional is recommended.