This page is awaiting clinical review by Dr. Renuka.
Understanding teeth whitening
Teeth whitening uses a bleaching gel to lighten the colour of natural tooth enamel. It can be done in the clinic, with take-home trays provided by the dentist, or with a combination of both, depending on what your dentist recommends.
Whitening works on natural teeth only. It does not change the colour of crowns, veneers, fillings or dentures, so any visible restorations may need to be considered as part of your plan.
When someone may need it
- Teeth have yellowed or darkened with age
- Teeth are stained by tea, coffee, food or tobacco
- You would like a brighter smile before an event
- You are planning other cosmetic work and want to match a lighter shade
What to expect
Your dentist will first check your teeth and gums. Decay, gum problems or exposed roots may need attention first. A cleaning is often done beforehand to remove surface stains and tartar.
During in-clinic whitening, the gums are protected and the gel is applied to the teeth. For home whitening, custom trays are made and you are shown how to use them safely. Results vary depending on your natural tooth colour and the cause of discolouration.
The treatment process
- 1
Assessment
Your dentist checks whether whitening is suitable and records your starting shade.
- 2
Cleaning
A cleaning may be recommended to remove surface stains first.
- 3
Whitening
The gel is applied in the clinic or using custom trays at home, as advised.
- 4
Review
Your dentist checks the result and any sensitivity.
Potential benefits & limitations
Potential benefits
- Can lighten the natural shade of teeth
- Non-invasive; does not involve drilling
- Supervised by a dentist, with your oral health checked first
Things to consider
- Temporary sensitivity of teeth or gums is common
- Does not change the colour of crowns, veneers or fillings
- Results vary and some stains respond less well
- Results fade over time and may need touching up
General aftercare
- Limit tea, coffee, red sauces and tobacco, especially in the first few days
- Use a toothpaste for sensitive teeth if advised
- Do not use whitening products more often than recommended
- Keep up regular brushing and cleanings to help results last
- Follow the specific instructions your dentist gives you
Frequently asked questions
Is teeth whitening safe?
Whitening supervised by a dentist is generally considered safe for suitable patients. Your dentist will check your teeth first and advise on how to reduce sensitivity.
How long do results last?
It varies. Results can last from several months to a few years, depending on your diet, habits and care.
Will whitening work on my crown or filling?
No. Whitening only lightens natural teeth. Visible crowns or fillings may need replacing afterwards to match the new shade.