Originally published: November 2023 Updated: June 2026
Teeth whitening is safe, effective, and one of the most popular cosmetic dental treatments we offer at Dentistry on George. But it is not right for everyone — and understanding whether it suits your situation before you start will save you time, money, and disappointment.
This guide covers everything you need to know before beginning a whitening course.
Not all teeth whiten the same way
Everyone’s teeth are different, and whitening results vary considerably from person to person. Some teeth whiten quickly and dramatically. Others take longer, whiten less, or do not respond at all.
The cause of the discolouration matters:
- Yellowing from food, drink, or age — tends to respond well to whitening
- Grey tones or discolouration from antibiotics — more difficult to treat and may require other options
- Developmental issues with the enamel — whitening alone may not achieve the desired result
- Staining from within the tooth — may require further treatment such as bonding, veneers, or crowns to achieve the cosmetic result you are after
Your dentist will assess the cause of your discolouration and give you an honest estimate of what whitening is likely to achieve for your specific teeth.
Existing dental work will not whiten
This is one of the most important things to understand before starting. Crowns, veneers, white fillings, bridges, and dentures will not change colour with whitening gel. Only natural tooth structure responds.
If you have visible restorations in your smile — fillings on front teeth, a crown, or veneers — whitening the surrounding natural teeth may create a colour mismatch. Your dentist will identify any restorations during your assessment and factor this into the plan.
In some cases, whitening is done first, and then any old fillings or restorations are replaced to match the new shade once the whitening is complete.
Your teeth and gums need to be healthy first
Teeth whitening should only be started once your mouth is healthy. Issues that need to be addressed beforehand include:
- Tooth decay — whitening gel can penetrate cavities and cause significant pain
- Gum disease — active gum disease should be treated before any cosmetic work
- Exposed root surfaces — these are more sensitive and may require desensitising treatment first
- Poorly sealed fillings — gel can penetrate these areas and cause discomfort
A professional check-up and clean before starting is not optional — it is part of the process. Plaque and calculus on the teeth will also prevent the whitening gel from working effectively.
Medical considerations
Before recommending whitening, we take your medical history into account. Some patients develop allergies to whitening products — your dentist will screen for this. If you have a known allergy to peroxide, whitening may not be suitable.
Pregnancy and breastfeeding: Teeth whitening is not recommended during pregnancy or while breastfeeding. There is limited research on the effects of whitening chemicals during this time, and the cautious approach is to wait until after.
Age: Teeth whitening is not recommended for children or young teenagers. The pulp of the tooth is larger in younger patients, making them more susceptible to sensitivity and damage. Your dentist will advise on the appropriate age to begin.
What to expect at your whitening consultation
At your consultation at Dentistry on George, we will:
- Examine your teeth and gums and address anything that needs treatment first
- Assess the cause of your discolouration and advise on likely results
- Identify any existing restorations that will not whiten
- Take your medical history including any allergy history
- Discuss the process, timeline, and what results are realistic for you
- Go through costs and answer any questions you have
If whitening is suitable, we will take digital scans of your teeth to fabricate your custom trays. These are ready within a few days, and you collect your kit at a second short appointment.
How long does whitening take?
Most patients whiten daily for four to six weeks to achieve their desired result. Some discolouration takes longer. Patients who experience sensitivity may need to take breaks, which extends the timeline.
Patience is key — the process cannot be safely rushed. Using more gel or wearing trays for longer does not speed up results and can cause damage.
Is whitening a permanent result?
No — and it is important to be realistic about this. The lighter shade will gradually regress over time, particularly with regular consumption of staining foods and drinks. Most patients find a top-up course every six to twelve months keeps their smile looking its best.
The advantage of custom trays is that top-up whitening is simple and cost-effective — you just need to purchase additional gel rather than going through the whole process again.
Ready to find out if whitening is right for you?
Book a consultation at our Brisbane CBD dental practice and we will give you an honest assessment of what whitening can achieve for your teeth.
If you are unsure whether whitening, veneers, or bonding is the right option, read our guide to choosing the right cosmetic treatment.
For tips on getting the best results once you start, see our post on common whitening mistakes to avoid.
Call us on 0732111155 or book online.
