Smoker's Teeth: Can Whitening Strips Help?

Can whitening strips help smoker's teeth? Yes, on the stain: the ADA and Bupa both name tobacco among the causes of tooth staining, and a whitening agent works chemically on the coloured compounds behind it. What strips cannot do is hold a result in place while you are still adding new stain, so if you still smoke, a whiter shade needs topping up rather than a single course. They also cannot change the base colour of dental work, remove tartar or deal with anything a dentist needs to see. This guide covers what tar and nicotine do to the tooth surface, what a 2017 clinical trial on whitening in smokers found, and how topping up works.

By smoker's teeth, this guide means the yellow and brown staining tobacco leaves on teeth. Smoking also affects the gums and the rest of the mouth, and those are questions for a dentist rather than for a whitening brand.

What tar and nicotine do to the tooth surface

Bupa's article on how smoking affects oral health, written by Dr Neil Sikka, Director of Dentistry at Bupa Dental Care, and dated 14 November 2025, describes it directly: "When you smoke cigarettes, the nicotine and tar in tobacco coat your teeth and seep into the pores of your enamel." It goes on: "At first, this can make your teeth look yellow. Over time, especially if you’re a heavy smoker, it could turn your teeth brown."

The American Dental Association, a United States body, sorts tooth discolouration into two groups. "Extrinsic stains commonly result from an accumulation of colored compounds on enamel", and the ADA says extrinsic discolouration is "primarily associated with environmental factors or individual behaviors, such as tobacco use". It adds that extrinsic stains "can be exacerbated by lifestyle habits (e.g., smoking or chewing tobacco)". The second group is intrinsic: "Intrinsic stains occur inside the tooth (within the enamel or the underlying dentin)".

So the two sources describe tobacco stain from two angles. The ADA lists tobacco use among the causes of the stain that builds up on enamel, and Bupa describes nicotine and tar seeping into the pores of the enamel. Bupa's professional teeth whitening page, clinically reviewed by Dr Gurmandeep Sond and Dr Emma Ajimoko of Bupa Dental Care and last reviewed on 30 June 2025, also lists smoking among the causes of discolouration that might lead someone to have professional whitening.

Vaping is a separate question with its own evidence, and we have gone through it in our guide to whether vaping stains teeth.

Nicotine staining

Why does nicotine stain teeth when it has no colour of its own? The authors of a 2017 clinical trial on whitening in smokers, writing in the discussion of their paper and citing earlier work, explain it: nicotine is "an inherently colorless substance", but "it turns yellow when it comes in contact with oxygen". They add that it gets into the small irregularities of the tooth surface and stains it, and that the other components of tobacco smoke, tars among them, "cause dental discoloration due to their dark hue and ability to adhere to dental surfaces".

Put together with Bupa's description, that is nicotine staining in plain terms: nicotine and tar coat the teeth and seep into the pores of the enamel, which can make teeth look yellow at first and, over time, especially in a heavy smoker, brown.

Can whitening strips help smoker teeth?

On the stain, yes. The ADA's summary of the evidence is that "Whitening treatments can be effective on both extrinsic and intrinsic staining". For tobacco stain, which the sources above describe both on the enamel and in its pores, that is the point that matters. A whitening agent works chemically on the coloured compounds rather than scrubbing at the surface.

Our PAP teeth whitening strips use PAP, which is peroxide free, and it still works on the coloured compounds inside the tooth, just by a gentler route than peroxide takes. There is more on the chemistry in how PAP whitening works. The claim on the box is a ceiling rather than a promise: up to 6 shades whiter in 14 days, depending on where you start. How far a smoker's teeth move depends on that starting point, which is why we do not put a number on it here.

What a clinical trial on whitening in smokers found

A 2017 clinical trial followed whitening in smokers and non-smokers for two and a half years: de Geus and colleagues, "Effects of At-home Bleaching in Smokers: 30-month Follow-up", in the journal Operative Dentistry. Its scope matters more than its headline, so here it is first.

• What was tested: a 10% carbamide peroxide gel, worn at home in trays made for each participant by the study team, for three hours a day for three weeks. That is a peroxide tray system, a different product from strips, ours included.
• Who took part: 30 smokers, each smoking at least 10 cigarettes a day, and 30 non-smokers, aged 18 to 54 and in good general and oral health. The 30-month follow-up was carried out on the Brazilian participants of an earlier study, and 21 smokers and 22 non-smokers came back for it.
• Funding and interests: partially supported by the National Council for Scientific and Technological Development (CNPq). The authors declare no proprietary, financial or other personal interest in any product in the paper.

The shade changed in both groups and was still there a month later. By 30 months it had slipped back a little: "color rebound was observed after 30 months for both groups of participants", whether the teeth were measured before or after a professional clean. On the colour measurements it took, the trial found no statistically significant difference between the smokers and the non-smokers who came back. That is a measurement of tooth colour in one trial, not evidence that smoking leaves teeth unaffected. The professional clean made the teeth significantly whiter in both groups, which the authors put down to removing the stain that had built up on the surface, from diet in both groups and from cigarette smoke as well in the smokers. Even after the clean, the teeth were slightly darker than at the one-month check, so the authors conclude that surface stain was not the only reason for the change.

The authors are open about the limits. They write that "we cannot deny the fact that over time smokers are theoretically more prone to having stain deposition on their dental surfaces than are nonsmokers". They expected the smokers' teeth to be darker than the non-smokers' at 30 months and did not find it, and they offer reasons the difference may not have shown up yet: "Perhaps 30 months is still too short term a follow-up for nicotine and tar to penetrate the tooth and change its color intrinsically." The participants had also had a professional clean at the 12-month check, and "some participants stopped or decreased smoking during this 30-month follow-up".

So the fair reading is narrow. In one trial of a peroxide tray system, whitening changed the measured shade in smokers, and by two and a half years the colour had slipped back in both groups, with part of that slip reversed by the study's professional clean. The lack of a measured difference between the groups comes with the limits above: 17 of the 60 participants missing from the final check, a follow-up the authors suggest may be too short, a professional clean partway through, and some smokers cutting down or stopping. It does not tell you what strips will do, and it does not settle how smoking affects a whitening result over the longer term.

What whitening cannot do while you still smoke

The honest limit is about the stain that is still arriving. Our strips will not hold a result in place while you are still adding new stain. On how long tooth whitening lasts, the UK's Oral Health Foundation says: "Smoking and drinks like tea, coffee and red wine can cause staining to return more quickly. Good brushing and regular dental cleaning help maintain the result."

Three other limits apply whether you smoke or not:

• Dental work. Our strips cannot change the base colour of a crown, veneer, filling or bonding, but they can lift staining that has built up on top of it. A restoration that matched before can stand out once the teeth around it lighten, which is the whole subject of our guide to whitening with composite bonding, crowns and veneers.
• Tartar and decay. Our strips do not remove tartar or treat decay. We have covered which marks on a tooth are stain and which need a dentist in our guide on how to remove stains from teeth.
• Your gums. Bupa's smoking article says: "You’re twice as likely to develop gum disease from smoking." Our box says not to use the strips with gum disease, ulcers, exposed gums or recent oral surgery. Bupa's article also says: "Visit your dentist for regular check-ups. They can look out for early signs of mouth cancer as well as signs of gum disease that may have been masked by smoking."

If irritation occurs while you are using the strips, the box says to stop and let it settle, and to see a dentist if it persists.

Topping up if you still smoke

A course and a top-up routine do different jobs. The course is one strip a day for 14 days, which on our strips means one set a day, a smaller strip on the lower teeth and a larger one on the upper, each worn for a minimum of 30 minutes. That gets you to a shade. Holding it is 2 to 3 strips a week afterwards, and the details are in our guide on how often to use whitening strips.

For someone who still smokes, that weekly routine matters more, because the source of the stain is still there. Top-ups are repeat use, so they need strips beyond the course itself. A single box of 28 is one full course. The 56 strip bundle saver is two boxes of the 28, so the bundle saver covers a course and a second box for top-ups.

The routine around each strip is the same as during the course: brush, dry your teeth with a towel, apply the smaller strip to the lower teeth first and then the upper, and press firmly. No eating while they are on, though a sip of water is fine. Afterwards, avoid coffee, tea, red wine and strongly coloured food for about an hour.

The box includes a shade guide, so you can see whether the top-ups are keeping up. Note your shade before the course, then check it again at the end of the course and as you top up. Our guide to reading a tooth shade chart explains how a shade is counted.

Why smoker's teeth are part of the Pure Glow story

Smoking is part of the story behind Pure Glow. I worked a three-shift pattern, drank a lot of coffee and was smoking at the time, and I noticed my teeth staining.

A holiday to Ibiza was what pushed me into trying whitening, and it went badly. Peroxide strips gave me bad sensitivity and made my teeth feel brittle. The non-peroxide ones would not stick, slid around, gave patchy results and left gunk behind. I used three sets by the pool and none of them stuck.

Back home I bought every whitening strip I could get and catalogued every fault, and it took ten months of testing and four rejected formulas to get to the one we use now. The formula we settled on carries no peroxide, and there is more on that on our page about peroxide-free whitening strips.

If you want to stop smoking

Whether and how to stop smoking is not a question for a whitening brand, and we are not going to answer it. The NHS has a Better Health service for it. Its quit smoking page says: "It's never too late to quit and it's easier to stop smoking with the right support."

Frequently asked questions

What do smoker teeth look like?
Bupa says nicotine and tar can make teeth look yellow at first, and that over time, especially in a heavy smoker, they could turn brown.

What causes nicotine staining on teeth?
Nicotine has no colour of its own, but the authors of the 2017 smokers' trial write that it turns yellow when it comes in contact with oxygen. They add that tar and the other components of smoke discolour teeth through their dark colour and their ability to stick to the tooth surface.

Can whitening strips remove nicotine stains?
The ADA says whitening treatments can be effective on both extrinsic and intrinsic staining. Our strips are peroxide free, and they still work on the coloured compounds inside the tooth, just by a gentler route than peroxide takes. The shade claim is a ceiling: up to 6 shades whiter in 14 days, depending on where you start. If you keep smoking, new stain keeps arriving, so a result will not hold on its own, and top-ups are 2 to 3 strips a week.

Can I smoke with whitening strips on?
No. Our FAQ says no food, tea, coffee or smoking while the strips are on, though a sip of water is fine. The strips go onto teeth you have just brushed and dried, for a minimum of 30 minutes, and smoking during that time puts nicotine and tar back onto the surface you have just prepared.

---

Related reading:

• Keeping teeth white after whitening
• Coffee and tea stains on teeth
• How long teeth whitening lasts

Sources:

• Bupa, How does smoking affect your oral health?, by Dr Neil Sikka, Director of Dentistry, Bupa Dental Care, with Michelle Harrison, Freelance Health Editor, 14 November 2025, next review due November 2028. For how tar and nicotine stain teeth, gum disease and check-ups.
• Bupa Dental Care, Professional teeth whitening, clinical review by Dr Gurmandeep Sond and Dr Emma Ajimoko, page last reviewed 30 June 2025. For smoking among the reasons teeth become discoloured.
• American Dental Association, Oral Health Topics: Whitening, last updated 16 August 2022. For extrinsic and intrinsic stain, tobacco use, and what whitening can act on.
• de Geus JL, Fernández E, Kossatz S, Loguercio AD, Reis A. Effects of At-home Bleaching in Smokers: 30-month Follow-up. Operative Dentistry 2017;42(6):572-580, doi 10.2341/16-126-C. A clinical trial of 10% carbamide peroxide in trays, not strips.
• Oral Health Foundation, Tooth whitening, last reviewed April 2026. For staining returning after whitening.
• NHS Better Health, Quit smoking. Quoted on stopping smoking, and linked rather than summarised.