Teeth whitening lightens the natural colour of your teeth using a peroxide gel. In Australia, the most predictable results usually come from whitening that is assessed and supervised by a registered dental practitioner. This guide explains the main options, what the rules say, the possible side effects and who should wait before whitening.
Teeth whitening options in Australia
There are three main ways to whiten teeth:
- In-chair whitening: a dental practitioner applies a stronger whitening gel while protecting your gums. You usually see a change after one appointment.
- Take-home whitening trays: your dentist makes custom trays that fit your teeth and supplies a gel you wear at home for a set time each day. Results build up over one to two weeks.
- Over-the-counter kits: strips, pens and kits sold in pharmacies, supermarkets and online. These contain lower-strength ingredients, and poorly fitting trays can let gel irritate the gums.
What the rules say about whitening strength
In Australia, products containing more than 6% hydrogen peroxide can only be used by a registered dental practitioner. This is one reason professional teeth whitening can work faster than shop-bought kits, and why it should be done under supervision.
Is teeth whitening suitable?
Teeth whitening is generally suitable when your mouth is checked first and the treatment is supervised. Possible side effects include:
- Temporary tooth sensitivity, especially to cold
- Irritation of the gums, lips or tongue, which usually settles within a day or two
- Nausea or stomach irritation if gel is swallowed
Whitening can also make existing problems worse, such as cracked teeth or untreated decay, which is why a check-up comes first.
Who should not whiten their teeth?
Teeth whitening is not recommended if you are pregnant or breastfeeding, or if you have very sensitive teeth, gum disease, cracked teeth or other untreated dental problems. Whitening is also not suitable for young children.
Will whitening work on crowns, veneers or fillings?
No. Whitening only works on natural tooth enamel. Crowns, veneers and tooth-coloured fillings keep their original shade, so they may look darker than your whitened teeth. If you have visible dental work, talk to your dentist before you start.
How long do results last?
Results vary. Tea, coffee, red wine, some foods and smoking can cause staining to return sooner. Good brushing, regular cleans and occasional top-ups can help keep teeth brighter for longer.
Teeth whitening FAQs
How much does teeth whitening cost?
The cost depends on whether you choose in-chair or take-home whitening and on your health fund cover. We provide a quote after your assessment.
Does teeth whitening hurt?
Most people do not feel pain, but some notice short-lived sensitivity. Your dentist can suggest a desensitising toothpaste or adjust the treatment time if this happens.
Can I whiten my teeth if I have sensitive teeth?
Possibly, but the cause of the sensitivity should be checked first. Your dentist may recommend treating it before you whiten or using a gentler approach.
Can I use teeth whitening strips from the supermarket?
Shop-bought strips contain lower-strength ingredients and are not custom-fitted, so results are usually slower and gel can irritate the gums. Having a check-up first helps you avoid whitening over decay or gum problems.
Professional teeth whitening in Penrith
If you are thinking about whitening, start with a check-up so your dentist can confirm it is suitable for you. Read more about teeth whitening in Penrith, compare professional and at-home kits, or book an appointment.
Source: Healthdirect Australia, Teeth whitening (reviewed February 2025). This article is general information only and does not replace an assessment with a registered dental practitioner.
Looking for more dental health tips? Browse all articles on the Penrith Dental Care blog, or meet the Penrith Dental Care team. Have a question? See our dental FAQ.
Reviewed by Mina Gibryal, BOHT (CSU), Grad Cert Dental Therapy (Melb), Practice Director, Penrith Dental Care. Last reviewed: 25 September 2026. This article is general information and not a substitute for an individual examination.