Does Corsodyl Stain Teeth? Chlorhexidine Stains Explained

Yes, it can. Corsodyl is one of the brand names chlorhexidine is sold under, and the NHS lists stained teeth among the common side effects of chlorhexidine dental treatments, alongside a change in the colour of your tongue. The NHS also says the staining "is not permanent and will go when you stop using chlorhexidine". In the research, the stain shows up after a few weeks of regular use, it is brown to black, it is worse with tea and red wine, and once it has built up it calls for a professional clean. Whitening can then lift what is left. This guide takes each of those in turn, explains which Corsodyl products actually contain chlorhexidine, and keeps well away from the one question that is not ours to answer, which is whether you should be using it.

What chlorhexidine is, and where Corsodyl fits

The NHS describes chlorhexidine as "an antiseptic and disinfectant" that "helps reduce the number of germs (bacteria) in your mouth or on your skin", and it lists Corsodyl first among the brand names it is sold under. Its mouth and throat treatments come, in the NHS's words, "as mouthwashes, lozenges, gels and sprays".

On how it works in the mouth, the NHS says: "With the dental treatments, chlorhexidine helps prevent the build-up of plaque by forming a protective coating over your gums and teeth."

Corsodyl is not one product, though, and not every product with the name on it contains chlorhexidine. That matters for the toothpaste question further down.

Why chlorhexidine stains teeth

The honest answer starts with an admission from the researchers themselves. A 2021 laboratory study in Frontiers in Dental Medicine, by Carey, Yagudayev and Font at the University of Colorado, says plainly that "The mechanism of CHX staining is still not completely understood" (CHX being the usual shorthand for chlorhexidine). The explanation it describes as the current thinking is a chemical browning reaction on the tooth surface involving carbohydrates, peptides and proteins, together with the breakdown of the chlorhexidine molecule itself.

What the same paper is clearer about is the role of what you eat and drink. It reports that earlier laboratory studies "demonstrated that dietary products with tannin-containing substances (chromogens) such as tea, red wine will increase the level of CHX staining." The same paper describes chlorhexidine as colourless in itself, with the brown and black coming from its combination with coloured compounds such as those in food and drink. The authors also note that "CHX stain is more pronounced on exposed dentin than enamel".

So if you are using a chlorhexidine product and you drink a lot of tea, coffee or red wine, the two are working together. We have looked at why teeth look yellow more generally, and the same three causes (the natural colour of the tooth, stain on the surface and tartar) are worth ruling in or out before you blame the mouthwash for everything.

One point of detail is worth knowing, because the sources do not all put this stain in the same box. The American Dental Association lists prolonged use of an antiseptic mouthrinse such as chlorhexidine among the causes of intrinsic discolouration, meaning colour inside the tooth. The Frontiers paper describes a stain that forms on the tooth surface from chromogens binding to it. Both can be true of the same mouth, and the practical answer below does not depend on settling it.

How long does it take for Corsodyl to stain teeth?

The NHS puts it simply: "You'll usually use chlorhexidine dental treatments for up to 4 weeks. They can stain your teeth if you use them for longer."

The research behind that comes from a Cochrane systematic review by James and colleagues (2017), which pooled the trials of chlorhexidine mouthwash used alongside brushing. The UK's National Institute for Health and Care Research summarised it in July 2017: "when used for longer than four weeks chlorhexidine mouthwash can lead to tooth staining and a build-up of chalky deposits on the teeth, called tartar." In the findings, "Tooth staining was also significantly increased among people using chlorhexidine at four to six weeks, seven to 12 weeks and six months."

The same summary is honest about what is not known: "There was insufficient data to draw conclusions about whether the frequency or concentration" of chlorhexidine changes the results. So the evidence cannot tell you that a weaker product will not stain, or exactly how many days it takes in your own mouth. What the evidence does say is that staining is a feature of the weeks, not the first few rinses.

How long you use it, and at what strength, is between you and whoever recommended it. The NHS advice is to follow the instructions that come with the product, or the advice from your doctor, dentist or pharmacist if it was prescribed.

Is the staining permanent?

No. On this the NHS is direct: "This is not permanent and will go when you stop using chlorhexidine. Make sure you brush your teeth regularly." It gives exactly the same answer for the tongue changing colour.

The research summary adds one practical detail. The NIHR's reading of the Cochrane review is that chlorhexidine use beyond four weeks "leads to tooth staining (requiring professional cleaning) and a build-up of tartar." Put the two together and the picture is reassuring rather than alarming: the stain is not a lasting change to the tooth, but once it has built up, brushing alone may not be what clears it.

Two further points from the NHS are worth keeping. If a side effect keeps bothering you or does not go away, it says to "speak to a doctor, dentist or pharmacist". And it says to stop using chlorhexidine dental treatments and speak to a dentist, doctor or pharmacist, or call 111, "if your mouth is sore or irritated". Those are its instructions, not ours, and they are the ones to follow.

Does Corsodyl toothpaste stain teeth?

This is where the brand name causes confusion, because the toothpastes and the treatment mouthwashes are different formulas.

Corsodyl's own FAQ says the main ingredients in its Complete Protection toothpaste "are sodium bicarbonate and sodium fluoride", and it answers the staining question for that toothpaste directly: it "will not stain your teeth". That is the brand's own statement about its own product, and we are reporting it rather than testing it.

The same FAQ lists the products that do contain chlorhexidine digluconate as the 0.2% Mouthwash, the Mint Mouthwash, the Original Mouthwash, the 1% w/w Dental Gel and the Spray (one of its two lists leaves out the Spray). No toothpaste appears in either list.

Does Corsodyl mouthwash stain teeth?

The treatment mouthwashes are the chlorhexidine products, so this is the form the NHS staining advice and the research above are about. The FAQ describes the Corsodyl Medicated Mouthwash range as "chlorhexidine digluconate 0.2% w/v".

There is also a daily mouthwash, and it is easy to mix up with the treatment range. Corsodyl's FAQ says its Daily Mouthwash "contains 250 ppm fluoride to help prevent cavities and a low concentration of chlorhexidine digluconate" at 0.06% w/v "to help reduce plaque build up." So it contains chlorhexidine too, at a lower strength. Given the Cochrane finding that the data cannot yet say whether concentration changes staining, the fair statement is that the daily product contains the ingredient associated with staining, and that how much a lower strength stains has not been settled by the evidence we read.

If you are not sure which one is in your bathroom, the ingredients list is the answer: look for chlorhexidine digluconate.

Corsodyl, gum problems and whitening strips

One thing needs saying before anything about lifting the stain. Chlorhexidine is often used because something is going on with the gums or the mouth: the NHS lists mouth infections, mouth ulcers and gum disease among the things it can help with. Our own box carries a clear warning that the strips are not for use with gum disease, ulcers, exposed gums or recent oral surgery.

So if you are rinsing with Corsodyl because of a gum problem or an ulcer, whitening is a later step, once your dentist is happy that the problem has cleared. That is not a comment on the mouthwash. It is what our own label says.

There is also a simple matter of timing. While a chlorhexidine product is in daily use, the stain it contributes keeps arriving. Whitening at the same time is working against a source that is still running, which is the same reason we say whitening cannot hold a result in place while you are still adding new stain.

How to remove Corsodyl staining

Once the gums are fine and the stain is still there, there are two routes, and they do different jobs.

A hygienist clean

This is the route the research summary points to when it says the staining requires "professional cleaning". Bupa's dental hygiene page, clinically reviewed by Caitlin Miller, Head of Dental Hygiene and Therapy at Bupa Dental Care, and last reviewed on 30 September 2025, describes it: the hygienist removes plaque and tartar, and "They might also use a paste to polish the surface of your teeth (the tooth enamel), removing stains and leaving your teeth clean and shiny." Because the research also links chlorhexidine with a build-up of tartar, a hygienist appointment deals with both at once, and tartar needs a dental professional to remove it.

Whitening strips

Whitening is the route that works chemically rather than by polishing. PAP+ teeth whitening strips lift surface stain, and they also work on the coloured compounds inside the tooth, by a gentler route than peroxide takes. That second half matters here, because of the American Dental Association's point that prolonged chlorhexidine use can affect colour inside the tooth as well as on it. If you want the chemistry, we have written up how PAP whitening works.

The strips Pure Glow makes are peroxide-free teeth whitening, clinically tested for zero sensitivity, with hydroxyapatite to support the enamel surface and xylitol in the same formula. The course is one strip a day for 14 days, worn for a minimum of 30 minutes, and the result is up to 6 shades whiter, depending on where you start. Dry your teeth with a towel after brushing and the no-slip grip keeps the strip where you put it, and it comes off clean.

One limit applies to whitening strips, ours included. Strips will not re-colour a composite, a crown or a veneer, although stain that has built up on top of dental work can lift. If chlorhexidine has darkened a bonded tooth or a filling as well as your natural teeth, our guide to whitening bonding, crowns and veneers explains what to expect from each.

For the full picture of which stains you can deal with at home and which need a dentist, our guide on how to remove stains from teeth sorts them into piles before you spend anything.

Keeping the stain down while you use it

There is no guidance of ours here, only what follows from the sources. The NHS says to brush your teeth regularly. And the NHS says that after a chlorhexidine mouthwash you should "Wait at least 30 minutes before having something to eat or drink."

The NHS is also clear that "There is no specific food or drink to avoid when using chlorhexidine." The laboratory research adds that tannin-rich drinks such as tea and red wine increase the stain, so if staining is your concern, those are the drinks it points to. The founder of Pure Glow, Daniel, came to whitening through exactly that kind of stain. Working a three shift pattern, drinking a lot of coffee and smoking at the time, he noticed his teeth staining. There is no mouthwash in his story and we are not going to invent one, but the lesson is the same: the colour builds up from what keeps passing over the tooth.

Frequently asked questions

Does Corsodyl stain teeth?
The chlorhexidine products can. The NHS lists stained teeth as a common side effect of chlorhexidine dental treatments and says it is not permanent and will go when you stop using chlorhexidine.

How long does it take for Corsodyl to stain teeth?
The NHS says chlorhexidine dental treatments can stain your teeth if you use them for longer than the usual 4 weeks. The Cochrane review summarised by the NIHR found staining when chlorhexidine mouthwash was used for longer than four weeks, and found it significantly increased at four to six weeks. The data could not say whether strength or frequency changes that.

Which Corsodyl doesn't stain teeth?
Corsodyl's own FAQ says its Complete Protection toothpaste will not stain your teeth, and its main ingredients are sodium bicarbonate and sodium fluoride. The products the FAQ lists as containing chlorhexidine digluconate are the treatment mouthwashes, the dental gel and the spray, and the Daily Mouthwash contains it at a lower strength.

Can mouthwash stain teeth?
Chlorhexidine mouthwash can, and that is the one the NHS and the research we read describe. Because the staining in those sources is tied to chlorhexidine specifically, the first thing to check on any mouthwash is whether chlorhexidine is in the ingredients. We have not found a named source on other mouthwash ingredients that we could check, so we are not going to guess.

Will the stain come off on its own?
The NHS says it will go when you stop using chlorhexidine. The NIHR summary of the research describes the staining as needing professional cleaning, so a hygienist visit is the route the research points to if it has built up.

Can I use whitening strips while using Corsodyl?
Not if you are using it for gum disease or a mouth ulcer, because our box says the strips are not for use with gum disease, ulcers, exposed gums or recent oral surgery. Once your dentist is happy with your gums, whitening can lift what is left. Using strips while the stain source is still in daily use means working against new stain as it arrives.

Does mouthwash whiten teeth?
Some mouthwashes are sold on whitening. If one lists peroxide in its ingredients, we have covered what peroxide does to teeth, and the UK limits on it, in our guide to hydrogen peroxide on teeth.

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Related reading:

• Coffee and tea stains on teeth
• Foods that stain teeth
• Smoker's teeth and whitening strips
• Keeping teeth white after whitening

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Sources:

• NHS, Side effects of chlorhexidine, with the NHS chlorhexidine pages on what it is, how to use it and common questions. Last reviewed 19 August 2024. For the stained teeth side effect and the brand names (side effects and about pages), the 4 week usual course and waiting 30 minutes (how to use), and the protective coating over teeth and gums and food and drink (common questions).
• National Institute for Health and Care Research, Chlorhexidine mouthwash is useful short-term for people with mild gum disease, July 2017, summarising James P, Worthington HV, Parnell C and others, Chlorhexidine mouthrinse as an adjunctive treatment for gingival health, Cochrane Database of Systematic Reviews 2017, CD008676. For the timing of staining and the need for professional cleaning.
• Carey CM, Yagudayev A, Font K, Effect of Temperature on Tooth Staining by 0.12% Chlorhexidine Gluconate, Frontiers in Dental Medicine 2021. A laboratory study on dentine samples, funded by University of Colorado departments, with no conflicts declared. For the mechanism being incompletely understood and tea and red wine increasing the stain.
• Corsodyl, Frequently asked questions. The brand's own statements about which of its products contain chlorhexidine and about its Complete Protection toothpaste.
• American Dental Association, Oral Health Topics: Whitening. For prolonged antiseptic mouthrinse use listed among the causes of intrinsic discolouration.
• Bupa Dental Care, Dental hygiene appointments, clinically reviewed by Caitlin Miller, last reviewed 30 September 2025. For what a hygienist's polish does.