Whitening is not permanent; natural staining continues afterwards. The right question is not “is it permanent” but “how long does it last and how can it be extended”.
Average duration
Depending on diet and oral hygiene, results are typically maintained for 1–3 years. This shortens noticeably for people who drink tea, coffee or red wine, or who smoke.
In-office vs home whitening
In-office
Applied in a single session with a high-concentration gel and light source. Results are visible the same day; the gum is protected with a barrier.
Home
Applied at home using a custom tray and low-concentration gel. Results develop over 1–2 weeks with a softer transition and usually less sensitivity.
When whitening does not work
- Crowns, fillings and prostheses do not whiten and may need replacing for colour match.
- Results are limited in tetracycline-related grey discolouration; laminate veneers are more predictable.
- A single root-treated tooth requires a different, internal technique.
The first 48 hours: white diet
Enamel is temporarily more permeable for two days. Avoiding coffee, tea, cola, red wine, tomato sauce, dark fruit and smoking directly affects the quality of the result.
Extending the result
- Drink staining beverages through a straw.
- Have scaling every six months.
- Use top-up applications at the intervals your dentist recommends.
An examination always precedes whitening: applying it while decay or gum inflammation is present significantly increases sensitivity.