Which method suits whom?
In-office whitening uses a stronger gel applied at the practice while the gums are protected, and the result is clearly visible after one session. Home whitening uses a milder gel in custom-made clear trays, worn for several weeks as the dentist advises. In some cases the two are combined.
A single root-filled tooth that has darkened over time can be whitened from the inside (internal whitening).
What to know beforehand
- Fillings, crowns and composite veneers do not lighten with whitening. If you have such restorations on your front teeth, they may need to be replaced afterwards.
- Decay and gum problems are treated before whitening.
- Whitening is postponed during pregnancy and breastfeeding.
- The shade you can reach depends on the structure of your teeth; not every tooth lightens to the same degree.
How does the process work?
Examination
Your teeth and gums are checked, and a scale and clean is done if needed.
Starting shade
The starting colour is recorded with the Vita shade guide.
Application
Depending on the method, the gel is applied at the practice or the trays are handed over.
Review
The result is assessed and advice is given on keeping the colour.
Afterwards
Temporary sensitivity to hot and cold is possible in the first days. Avoiding dark foods and drinks during this time protects the result. How long the colour lasts depends on diet, smoking and oral care; a top-up can be done at intervals if needed.
Compare the shades
Move the slider to see the starting shade next to a shade a few steps lighter. The real result depends on the structure of your teeth.
Frequently asked questions
Does whitening damage teeth?
It is considered safe when done under a dentist's supervision, with gel of a suitable strength and the right timing. The most common side effect is temporary sensitivity. Products used without supervision can irritate the gums.
How long does it last?
It varies from person to person. Tea, coffee, red wine and smoking can make the colour return faster.
Will my fillings whiten too?
No. Fillings, crowns and composite materials do not lighten with whitening. Visible restorations can be replaced after whitening to match the new shade.
The information on this site is for general guidance only and does not replace an examination and diagnosis by a dentist. Results of any procedure vary from person to person. Please discuss the details with your dentist before treatment. Page last updated: 5 October 2026.