If your teeth have dulled from coffee, tea or red wine, a whitening toothpaste can help them look brighter by polishing off that surface film. If your teeth are naturally a deeper shade, it will not change that. The label promises whiter teeth, but what most of these pastes actually do is clean stain off the outside.
Two different ways of making teeth look whiter
Teeth can look whiter because stain has been removed from the surface, or because the colour of the tooth itself has been lightened. These are separate processes.
Surface stain, often called extrinsic stain, comes from things like tea, coffee, red wine and tobacco and settles on the enamel. Mild abrasives in toothpaste, such as hydrated silica, can polish it away. The underlying shade of the tooth, which comes largely from the dentine beneath the enamel, only changes when a bleaching agent such as hydrogen peroxide is held against the teeth for long enough to work. Some whitening toothpastes do contain a small amount of peroxide, but brushing lasts a couple of minutes and the paste is then rinsed away, so its effect on true tooth colour is limited.
That is why a whitening toothpaste can make stained teeth look noticeably fresher, while someone with clean but naturally yellow teeth may see little difference. Our guide comparing professional and at-home whitening explains how the shade itself is changed.
How abrasive is too abrasive
Because most whitening pastes rely on polishing, it is reasonable to ask whether they wear teeth down. Toothpaste abrasiveness is measured in the laboratory as relative dentin abrasivity, or RDA. The Australian Dental Association's consumer site explains that toothpastes with an RDA of 250 or less are considered "safe for a lifetime of use" under an international standard, and that different values below 250 do not make one paste more or less safe than another.
In practice, how you brush matters as much as what you brush with. Scrubbing hard, brushing for a very long time and using a firm brush all add to wear, especially on exposed root surfaces near the gums. A soft brush and gentle technique let the paste do its job without extra wear.
Charcoal pastes are a separate question
Charcoal toothpastes and powders are often sold as natural whiteners. A literature review in the Journal of the American Dental Association (Brooks and colleagues, 2017) found insufficient clinical and laboratory evidence to support the safety and effectiveness claims made for charcoal dentifrices. If you want to try one, use it gently and not as a replacement for a fluoride toothpaste. Our article on charcoal whitening goes into more detail.
Where toothpaste sits among the options
| Option | What it does | What to expect |
|---|---|---|
| Whitening toothpaste | Polishes off surface stain | Brighter-looking teeth if stain was the problem; little change to natural shade |
| Over-the-counter strips or gels | Low-strength peroxide in contact with teeth for set periods | Some lightening for many people |
| Dentist-supplied take-home trays | Custom trays hold whitening gel against the teeth | A visible shade change for many people over a few weeks |
| In-chair whitening | Higher-strength gel applied by a dental practitioner | A faster change, usually followed by take-home gel |
Where a whitening toothpaste is useful
Whitening toothpaste works well as a maintenance tool. It can slow the build-up of new stain if you drink coffee or tea regularly, and it can help keep a result after professional whitening for longer. If staining keeps coming back quickly, our guide to coffee, wine and tea staining has practical tips, and if you are concerned about wear, read does teeth whitening damage enamel.
It will not lighten a tooth that has darkened from the inside, change the colour of crowns or fillings, or give the same result as a whitening treatment. Results with any whitening approach vary from person to person.
What patients ask about whitening toothpaste
How soon will I notice a difference?
If surface stain is the issue, you may see a change within a few weeks of regular use. Once that stain is gone, there is not much more for the paste to remove, so the effect levels off.
Can I use it every day?
For most people, yes, provided it contains fluoride and you brush gently with a soft brush. If your teeth become sensitive, switch back to a regular fluoride toothpaste and mention it at your next check-up.
Is it worth using after professional whitening?
It can help keep new surface stain at bay, alongside rinsing with water after staining drinks and regular check-ups and cleans.
If you would like to know what is realistic for your teeth, book a free cosmetic consult with us in Melrose Park, or read about the teeth whitening options at Lumi.
This article is general information and not a substitute for personalised advice from your dentist.
