When comparing take home vs in chair teeth whitening, both use peroxide gels to lighten the natural colour of your teeth, and both can give a noticeable result. In-chair whitening works faster, usually in a single appointment, while take-home whitening works more gradually over a week or two using custom trays. The right choice depends on your timeframe, your budget, how sensitive your teeth are and the type of staining you have.
How professional teeth whitening works
Whitening gels contain hydrogen peroxide, or carbamide peroxide, which breaks down into hydrogen peroxide. The peroxide passes through the enamel and breaks apart the stain molecules inside the tooth, making the tooth appear lighter.
In Australia, whitening products containing more than 6% hydrogen peroxide (or the equivalent amount of carbamide peroxide) can only be supplied and used under the care of a dentist. That is one reason professional whitening is generally more effective and predictable than over-the-counter strips and toothpastes, which mostly work on surface stain.
What whitening can and cannot change
- Whitening works on natural tooth structure only. It does not change the colour of crowns, veneers, bonding or tooth-coloured fillings.
- Yellowish staining from ageing, coffee, tea and wine usually responds well.
- Greyish staining, such as from certain antibiotics taken in childhood, or a single dark tooth after an injury, responds less predictably and may need a different approach.
- White spots can sometimes look more noticeable during whitening, although they often blend in better afterwards.
Take-home whitening
With take-home whitening, your dentist takes a scan or impressions of your teeth and makes thin, custom-fitted trays. You place a small amount of whitening gel in the trays and wear them at home for a set time each day or overnight, usually for one to two weeks, depending on the product and the result you are aiming for.
Advantages
- Gradual results, so you can stop once you are happy with the shade
- Lower-concentration gels, which some people find gentler on sensitive teeth
- The trays can be kept and used with touch-up gel in future
- Generally lower cost than in-chair whitening
Limitations
- Requires consistency; results depend on wearing the trays as directed
- Takes longer to reach the final shade
- Some people find wearing trays inconvenient
Take-home whitening at our practice is $449, with suitability and the fee confirmed after assessment.
In-chair whitening
In-chair whitening is done in the dental chair in one appointment, usually around one to two hours. Your dentist first protects your gums with a barrier, then applies a higher-concentration gel to the teeth in several cycles, checking your comfort and progress along the way. Some systems use a light, although research is mixed on whether lights add much benefit beyond the gel itself.
Advantages
- A noticeable change in a single visit
- Done under direct supervision, with gums protected
- Useful if you have an event coming up
Limitations
- Higher cost than take-home whitening
- Sensitivity can be more noticeable afterwards because of the higher concentration
- Teeth can look extra white immediately after treatment because they are temporarily dehydrated, then settle slightly over the following days
In-chair whitening at our practice is $649, with suitability and the fee confirmed after assessment. Many dentists also suggest combining an in-chair session with take-home trays for maintenance.
Side by side: how they compare
| Feature | Take-home | In-chair |
|---|---|---|
| Time to result | About 1 to 2 weeks | One appointment |
| Gel strength | Lower | Higher |
| Control over shade | Gradual, stop when happy | Set within one session |
| Sensitivity | Often milder | Can be more noticeable |
| Fee at our practice | $449 | $649 |
Both options can produce similar results over time. Neither changes the colour of existing dental work.
Sensitivity, risks and who should wait
The most common side effect of whitening is temporary tooth sensitivity, and some people also experience gum irritation where gel touches the gums. Both usually settle within a few days of stopping. Using a sensitive toothpaste beforehand, taking breaks between sessions or using a lower-strength gel can help.
Whitening is usually not recommended:
- During pregnancy or breastfeeding, when it is generally deferred as a precaution
- For children and younger teenagers, whose teeth are still developing
- When there is untreated decay, cracked teeth, leaking fillings or gum disease, which should be treated first
- For people with severe existing sensitivity or exposed roots, unless your dentist advises otherwise
This is why a check-up comes first. Your dentist will check your teeth and gums, record your starting shade and talk through realistic expectations. Results vary from person to person.
How long do whitening results last?
Whitening is not permanent. Teeth gradually pick up stain again, and how quickly depends on your diet and habits. Many people find their results last from several months to a few years, especially with occasional touch-ups using take-home trays.
To help your results last:
- Limit coffee, tea, red wine, cola and curry, or rinse with water after them
- Avoid smoking
- Keep up regular check-ups and professional cleans to remove surface stain
- Brush twice a day with a fluoride toothpaste
What about over-the-counter and DIY whitening?
Supermarket and online whitening products are popular, so it is worth knowing how they differ from professional options. Whitening toothpastes mainly remove surface stain with mild abrasives or polishing agents; they can make teeth look brighter but do not change the colour inside the tooth. Strips and generic kits contain lower peroxide levels, and one-size-fits-all trays can let gel leak onto the gums, which can cause irritation.
Some DIY methods carry more risk than benefit. Rubbing teeth with lemon juice, vinegar or baking soda pastes can erode or wear enamel, and activated charcoal powders are abrasive, with little evidence that they whiten. Products bought from overseas websites may also contain peroxide levels that are not permitted for home use in Australia without a dentist.
If you have tried a store-bought product and were disappointed, it does not necessarily mean professional whitening will not work for you. Equally, if your teeth became very sensitive with a home product, mention it at your assessment so your dentist can tailor the approach.
Is whitening part of a bigger plan?
If you are considering other cosmetic work, such as veneers, bonding or crowns on front teeth, it is often sensible to whiten first. New restorations can then be matched to your lighter shade. Our cosmetic dentistry page covers the wider range of options.
When to see a dentist
See a dentist before starting any whitening product, including over-the-counter kits, if you have sensitive teeth, gum problems, a single dark tooth, or visible fillings or crowns on your front teeth. Stop whitening and contact your dentist if sensitivity is severe or does not settle after a few days. You can learn more about our teeth whitening options and what is involved.
Frequently asked questions
Which is more effective, take-home or in-chair whitening?
Both can achieve similar results. In-chair whitening is faster, while take-home whitening reaches a comparable result more gradually. Many people use both.
Does teeth whitening damage enamel?
When used as directed under a dentist’s supervision, professional whitening is not considered to damage enamel. Temporary sensitivity and gum irritation are the most common side effects.
How long does teeth whitening last?
It varies with diet and habits, but results often last from several months to a few years. Occasional touch-ups with take-home trays can help maintain the shade.
Will whitening change the colour of my crowns or fillings?
No. Whitening only works on natural teeth. Existing crowns, veneers and fillings may need replacing afterwards if you want them to match.
Can I whiten my teeth while pregnant?
Whitening is generally deferred during pregnancy and breastfeeding as a precaution. Talk to your dentist about the timing.
If you are thinking about whitening, a check-up is the place to start. Call North Ryde Dentistry on (02) 8090 1102 or book an appointment.
This article is general information only and is not a substitute for advice from your own dentist. Any treatment carries risks; your dentist will discuss whether it is suitable for you.