Last updated: March 2026. Clinical information cited from NHS.uk, the General Dental Council (GDC), Oral Health Foundation, and peer-reviewed dental research (PMC4058574). NHS dental charges confirmed from 1 April 2025.
You brush twice a day, floss regularly, and visit your dentist — yet your teeth still look yellow, stained, or discoloured. If that sounds familiar, you are far from alone. Tooth discolouration is one of the most common dental concerns in the UK, and it is rarely a sign that you are doing anything wrong.
The good news is that most staining can be treated, often more easily than you might expect. This guide explains why teeth change colour, what different stain colours mean, which professional treatments and home remedies actually work, and when you should see a dentist.
Extrinsic vs Intrinsic Staining: Why It Matters
Before exploring specific stain types, it helps to understand the two fundamental categories of tooth discolouration. This distinction determines which treatments will work for you.
Extrinsic Stains (Surface Staining)
Extrinsic stains form on the outer surface of your tooth enamel. They are caused by external factors — the food you eat, the drinks you consume, and habits like smoking.
"Largely due to environmental factors including smoking, pigments in beverages and foods, antibiotics, and metals such as iron or copper." — PMC4058574, Tooth Whitening: What We Now Know
Key characteristic: Extrinsic stains respond well to professional cleaning and whitening treatments. A hygienist scale and polish or Airflow treatment can often remove them entirely.
Intrinsic Stains (Internal Discolouration)
Intrinsic stains originate within the tooth structure itself — in the dentine or enamel — and cannot be removed by surface cleaning alone. Causes include:
- Tetracycline antibiotics taken during childhood, causing grey or brown banding
- Dental fluorosis from excessive fluoride during tooth development
- Trauma causing internal bleeding (producing a grey or dark "dead tooth")
- Root canal treatment — treated teeth can darken over time
- Silver amalgam fillings leaching metallic ions into surrounding tooth structure
"Tooth whitening can only lighten your existing tooth colour. It cannot make a complete colour change." — Oral Health Foundation, Tooth Whitening
Intrinsic stains require more intensive treatment — prolonged professional whitening, composite bonding, veneers, or internal bleaching.
Age-Related Discolouration
As you age, your teeth naturally become more yellow through two simultaneous processes. The outer enamel gradually wears thinner, revealing more of the naturally yellow dentine beneath. At the same time, the dentine itself thickens and darkens. This is entirely normal and affects everyone to some degree.
What Your Tooth Colour Is Telling You
Different colours often point to different causes. Here is what each type typically indicates.
Yellow Teeth
The most common type of discolouration. Usually caused by:
- Thinning enamel with age — revealing yellow dentine beneath
- Tea, coffee, and food staining — extrinsic surface deposits
- Tobacco use — nicotine turns yellow-brown when oxidised
- Plaque and tartar build-up — indicating oral hygiene improvements are needed
Can yellow teeth become white again? In most cases, yes. Extrinsic yellowing responds well to professional cleaning and whitening. Age-related yellowing can be significantly improved with professional whitening — in-chair treatments can achieve 6 to 8 shades lighter in a single appointment.
Brown Spots on Teeth
Brown staining can indicate several different conditions:
- Tea, coffee, and tobacco — the most common cause of generalised brown staining
- Tartar build-up — hardened plaque that appears brown or dark yellow
- Early tooth decay — brown spots on biting surfaces or between teeth may indicate cavities
- Moderate fluorosis — brown mottling from excess fluoride during childhood
The NHS lists "white, brown or black spots on your tooth" as signs of tooth decay. — NHS, Tooth Decay
Important: New brown spots on a specific tooth should always be checked by a dentist to distinguish between cosmetic staining and active decay.
Grey or Dark Teeth
Grey discolouration typically indicates intrinsic causes requiring dental assessment:
- Dead tooth — trauma or a failed root canal can cut off blood supply, causing the tooth to darken over weeks to months
- Tetracycline staining — grey-brown horizontal bands from antibiotics taken during childhood
- Amalgam fillings — metallic ions from silver fillings can cause surrounding tooth structure to appear shadowed or darkened
When to act: A single tooth turning grey — especially one that was previously normal — should be assessed promptly. It may indicate a dead tooth requiring root canal treatment.
White Spots on Teeth
White patches are a form of discolouration that often surprises patients:
- Mild dental fluorosis — the most common cause in the UK
"Very fine pearly white lines or flecking on the surface of the teeth." — Oral Health Foundation, Fluoride
- Demineralisation — early-stage decay causing chalky white spots where enamel minerals have dissolved. Common after orthodontic braces are removed
- Dental erosion — progressive enamel thinning from acidic food and drink
White spots from demineralisation can sometimes be improved with fluoride varnishes. Persistent white spots from fluorosis may need composite bonding or veneers.
Black Spots
Black discolouration ranges from small spots to widespread darkening:
- Heavy tartar — particularly near the gum line, often from chromogenic bacteria
- Severe tooth decay — advanced cavities produce dark brown to black discolouration
- Necrotic tooth — an advanced dead tooth can appear nearly black
Always see a dentist about black spots on teeth. They frequently indicate decay requiring treatment.
Foods and Drinks That Stain Your Teeth
Staining happens through three mechanisms: chromogens (colour compounds that bind to enamel), tannins (which make chromogens stickier), and acidity (which softens enamel, opening pores that absorb pigments).
Tea: The UK's Biggest Staining Culprit
This may surprise many readers, but tea stains teeth more than coffee. A dental study found that tea, cola, and red wine showed statistically significant staining differences, while coffee had less effect.
Tea — particularly black tea — is high in both tannins and chromogens. Given that tea is the UK's most popular hot drink by a considerable margin, this makes it the single most common cause of extrinsic tooth staining in the UK.
Tip: Adding milk to your tea may help. There is some evidence that casein protein in milk binds to tannins and reduces their staining potential.
Other Major Staining Culprits
| Food or Drink | Staining Mechanism | Stain Colour |
|---|---|---|
| Black tea | High tannins + chromogens | Yellow-brown |
| Coffee | Tannins + chromogens (less than tea) | Yellow-brown |
| Red wine | Anthocyanins + tannins + acidity | Brown, blue-grey |
| Cola and dark soft drinks | Chromogens + phosphoric acid | Brown |
| Curry and turmeric | Curcuminoid pigments | Deep yellow |
| Berries (blueberries, blackberries) | Deep pigments + acidity | Blue-purple |
| Balsamic vinegar | Dark pigment + high acidity | Brown-black |
| Soy sauce | Dark pigment + tannins | Brown |
| Tomato-based sauces | Lycopene + acidity | Orange-red |
| Tobacco | Nicotine + tar | Yellow to brown-black |
A note on white wine: Although pale in colour, white wine is more acidic than red wine. It softens enamel and can increase susceptibility to staining from other sources consumed alongside it.
Professional Stain Removal: UK Costs (2026)
The right treatment depends on the type and severity of your staining. Here is what is available and what it costs.
Scale and Polish
A professional scale and polish removes tartar, plaque, and superficial surface staining.
| Provider | Cost | Notes |
|---|---|---|
| NHS (Band 1) | £27.40 | Only when clinically necessary |
| Private hygienist | £58–£88 | 20–30 minute appointment |
| Private (London) | £80–£120 | Higher-end practices |
"Scaling is usually included in Band 1 (£27.40), but extensive treatment, or treatment for complex gum problems may be charged as a Band 2 (£75.30) treatment." — NHS, How Much NHS Dental Treatment Costs
Important: The NHS only provides a scale and polish when it is clinically necessary — not for purely cosmetic stain removal. For cosmetic cleaning, you will need a private hygienist appointment.
Airflow / Air Polishing
A growing treatment option that uses a high-pressure jet of warm water, air, and fine powder to blast away surface staining. Widely considered more effective than traditional polishing for stubborn extrinsic stains from tea, coffee, and tobacco.
| Option | Typical Cost |
|---|---|
| Add-on to hygienist appointment | £30–£50 extra |
| Standalone Airflow session | £80–£150 |
Airflow removes surface staining but does not change the underlying colour of your enamel. Think of it as a deep clean rather than a whitening treatment.
Professional Teeth Whitening
Whitening is not available on the NHS — it is classed as cosmetic treatment.
"Teeth whitening is not available on the NHS. You have to pay for it as a private patient at a dental surgery." — NHS, Teeth Whitening
| Treatment | Typical UK Cost | Results |
|---|---|---|
| In-chair whitening (Zoom, laser) | £300–£800 | 6–8 shades lighter in one session |
| Enlighten whitening | £395–£695 | Guarantees shade BL1 (lightest natural shade) |
| Take-home kit from dentist | £175–£475 | Gradual results over 2–4 weeks |
| Over-the-counter products | From £20 | Limited to 1–2 shades improvement |
"Research indicates that over-the-counter gels typically lighten teeth by 1 to 2 shades, while professionally applied products achieve more significant results." — PMC4058574, Tooth Whitening: What We Now Know
Professional whitening results can last around 3 years if you follow your dentist's aftercare advice, though this varies depending on diet and habits.
For a detailed breakdown of whitening options and pricing, see our teeth whitening cost UK guide.
Composite Bonding
For staining that whitening cannot address — such as tetracycline staining, fluorosis, or single discoloured teeth — composite bonding covers the tooth surface with tooth-coloured resin.
| Treatment | Typical UK Cost | Lifespan |
|---|---|---|
| Composite bonding (per tooth) | £235–£300 | 4–6 years |
| Composite bonding (4 teeth) | £995–£1,490 | 4–6 years |
For more on bonding costs and what to expect, see our composite bonding cost UK guide.
Dental Veneers
The definitive treatment for severe or treatment-resistant discolouration. Thin shells of porcelain or composite are bonded to the front of your teeth.
| Type | Cost Per Tooth | Lifespan |
|---|---|---|
| Composite veneers | From £300 | 5–6 years |
| Porcelain veneers | From £850 | 10–20 years |
Porcelain veneers are highly stain-resistant — an advantage for patients prone to recurring staining. See our dental veneers cost UK guide for full pricing details.
Internal Bleaching (for Dead or Grey Teeth)
If a single tooth has darkened after trauma or root canal treatment, internal bleaching can lighten it from the inside. A bleaching agent is placed inside the root canal chamber and left for 1 to 2 weeks.
- NHS: Available if clinically necessary (Band 2: £75.30)
- Private: Approximately £200–£400 for the full course
"Internal bleaching of a non-vital tooth can be provided under the NHS, provided it was deemed clinically necessary by the performer." — NHS BSA, Bleaching of Teeth FAQ
Which Treatment Is Right for You?
| Your Situation | Recommended First Step |
|---|---|
| Surface stains from tea, coffee, tobacco | Scale and polish or Airflow |
| Generally yellow teeth, want to go whiter | Professional whitening |
| Single grey or dark tooth | Internal bleaching or bonding |
| Severe or banded staining (tetracycline) | Composite bonding or veneers |
| White spots from fluorosis | Composite bonding or microabrasion |
| Stained or discoloured fillings | Replacement with colour-matched composites |
Home Remedies: What Works and What to Avoid
The internet is full of DIY whitening advice. Here is what the evidence actually says.
Whitening Toothpaste — Modest but Safe
Whitening toothpastes contain mild abrasives and sometimes optical brightening agents. They can help maintain whiteness and remove light surface staining, but will not dramatically whiten already discoloured teeth.
Verdict: Safe and modestly effective for extrinsic stains. Expect no more than 1 shade improvement. Useful for maintaining results after professional whitening.
Baking Soda — Safe Occasionally, Limited Effect
Baking soda has very low abrasivity (RDA ~7, compared to 40–200 for most commercial toothpastes) and can gently clean surface stains.
Verdict: Safe to use a few times per week, but limited whitening effect. Should not replace fluoride toothpaste as your daily toothpaste.
Activated Charcoal — Not Recommended
Despite its popularity on social media, activated charcoal lacks evidence for whitening teeth and poses real risks.
"There is insufficient evidence demonstrating that charcoal-based oral care products...provide measurable benefit...with adequate safety and effectiveness." — ADA Evidence Review
Research published in the British Dental Journal found that charcoal toothpastes risk enamel abrasion, remove protective fluoride from the tooth surface, and have no credible evidence of whitening benefit.
Verdict: Not recommended. Risk of enamel damage without proven benefit.
Oil Pulling — No Whitening Evidence
Swishing oil around the mouth for 15 to 20 minutes has no documented whitening effect.
"An absence of documented tooth whitening derived from oil pulling." — ADA Oral Health Topics
Verdict: No evidence it whitens teeth. Not recommended as a whitening treatment.
Apple Cider Vinegar — Never Use on Teeth
Apple cider vinegar has a pH of approximately 2 to 3 (highly acidic). Applying it directly to teeth dissolves enamel — causing permanent damage, increased sensitivity, and ironically making teeth more yellow as the white enamel erodes to reveal darker dentine beneath.
"Every time you eat or drink anything acidic, the enamel on your teeth becomes softer for a short while, and loses some of its mineral content." — Oral Health Foundation, Dental Erosion
Verdict: Apple cider vinegar should never be applied to teeth. It causes irreversible enamel erosion.
Lemon Juice and Strawberries — Enamel Risk
Similar to apple cider vinegar, the citric acid in lemon juice (pH ~2) directly erodes enamel. Research found that a strawberry and baking soda mixture showed no measurable whitening improvement.
Verdict: Avoid. Enamel erosion risk without whitening benefit.
Summary: Home Remedies at a Glance
| Remedy | Does It Work? | Is It Safe? | Recommendation |
|---|---|---|---|
| Whitening toothpaste | Modestly, for surface stains | Yes | Use to maintain whiteness |
| Baking soda | Minimal | Yes (occasionally) | Safe but limited |
| Activated charcoal | No evidence | Risk of enamel damage | Avoid |
| Oil pulling | No evidence | Possible adverse effects | Avoid |
| Apple cider vinegar | No | Erodes enamel permanently | Never use |
| Lemon juice / strawberries | No | Erodes enamel | Avoid |
UK Whitening Regulations: Stay Legal, Stay Safe
The UK has strict rules about who can legally whiten your teeth — and for good reason.
Legal Concentration Limits
| Concentration | Who Can Use It |
|---|---|
| Up to 0.1% hydrogen peroxide | Available in consumer products (very limited effect) |
| 0.1%–6% hydrogen peroxide | Only a GDC-registered dental professional |
| Above 6% hydrogen peroxide | Prohibited entirely for cosmetic use |
"The maximum strength of hydrogen peroxide that a dentist can use in providing cosmetic tooth whitening treatment is 6%." — General Dental Council, What the Law Says
Who Can Legally Whiten Your Teeth
Only GDC-registered dental professionals can legally perform teeth whitening in the UK:
- Dentists — can provide whitening independently
- Dental hygienists and therapists — can provide whitening under a dentist's prescription
- Beauty therapists and salon workers — providing whitening is a criminal offence
"The law states that only registered dentists, dental therapists, dental hygienists, or clinical dental technicians working to the prescription of a dentist can legally and safely provide tooth whitening treatment." — General Dental Council
Whitening is also prohibited for anyone under 18 years of age.
The Dangers of Illegal Whitening
A BBC investigation in October 2025 found that some illegally sold whitening products contained more than 500 times the legal limit of bleaching agent. The risks include chemical burns to gums and lips, permanent enamel damage, nerve damage, and tooth loss.
"In the UK, only qualified dental professionals are allowed to carry out teeth whitening. In the wrong hands, teeth whitening can be extremely dangerous. It isn't just the excruciating pain, or the burnt lips and gums, but also the fact that it can lead to nerve damage and even tooth loss." — Eddie Crouch, Chair of the British Dental Association
The safest approach: Always have whitening performed by a GDC-registered dentist. You can verify a professional's registration on the GDC register.
How to Prevent Teeth Staining
Evidence-based tips to keep your teeth looking their best between dental visits.
Dietary habits:
- Use a straw for tea, coffee, cola, and other staining drinks to minimise tooth contact
- Rinse with water after consuming staining food or drink
- Add milk to tea and coffee — casein protein may bind to tannins and reduce staining
- Eat crunchy vegetables (apples, carrots, celery) which help clean tooth surfaces
Oral hygiene:
- Brush twice daily with fluoride toothpaste (at least 1,350 ppm fluoride for adults)
- Wait at least one hour before brushing after consuming anything acidic
"Wait for at least one hour after eating or drinking anything acidic before brushing your teeth." — Oral Health Foundation, Dental Erosion
- Floss or use interdental brushes daily to remove plaque between teeth
- Do not rinse immediately after brushing — let the fluoride work
Lifestyle:
- Stop smoking — tobacco is a major progressive cause of staining
- Visit your hygienist regularly — every 6 months for healthy teeth, or every 3 to 4 months if you are prone to staining
When to See a Dentist About Tooth Discolouration
Not all discolouration is purely cosmetic. Book a dental appointment if you notice:
- A single tooth turning grey or dark — may indicate a dead tooth
- New brown or black spots on a specific tooth — may indicate decay
- White chalky spots near the gum line — may indicate early decay
- Discolouration with pain or sensitivity — may indicate nerve damage
- Black lines at the gum line — may indicate tartar, decay, or a failing filling
- Any tooth colour changes in children — should be assessed for fluorosis, decay, or developmental conditions
Before any whitening treatment, your dentist should check that you have no active decay or gum disease, and that any crowns, veneers, or composite fillings on visible teeth are accounted for — because these will not respond to whitening agents.
Frequently Asked Questions
Can yellow teeth become white again?
In most cases, yes. Extrinsic yellowing from tea, coffee, and tobacco responds well to professional cleaning and whitening. Age-related yellowing can be significantly improved with professional whitening treatments, which can lighten teeth by 6 to 8 shades. However, whitening only works on natural tooth enamel — crowns, veneers, and fillings will not change colour.
Are brown spots on teeth always cavities?
No. Brown spots can be caused by tea, coffee, or tobacco staining, tartar build-up, or mild fluorosis. However, brown spots on biting surfaces, between teeth, or near the gum line may indicate early decay. A dentist can distinguish between cosmetic staining and cavities with a clinical examination and X-rays.
Why has my tooth turned grey?
A single grey tooth usually indicates that the tooth has lost its blood supply — often following an injury or trauma. Blood products break down inside the tooth and produce grey discolouration over weeks to months. This requires dental assessment and may need root canal treatment or internal bleaching.
Does charcoal toothpaste whiten teeth?
There is no reliable evidence that activated charcoal whitens teeth. Research in the British Dental Journal found that charcoal toothpastes can damage enamel through abrasion and strip protective fluoride from tooth surfaces. UK dental professionals consistently advise against their use.
Is teeth whitening safe?
Professional whitening performed by a GDC-registered dentist is safe. Around 57% of patients experience temporary sensitivity during or after treatment, but this typically resolves within 24 to 48 hours. The key risk is with unregulated whitening — beauty salon treatments and illegally strong products have caused chemical burns, nerve damage, and tooth loss.
How much does teeth whitening cost in the UK?
Professional in-chair whitening typically costs £300 to £800. Take-home kits from your dentist cost £175 to £475. Over-the-counter products start from around £20 but are limited to the legal 0.1% hydrogen peroxide concentration, making them far less effective. Whitening is not available on the NHS.
Does tea stain teeth more than coffee?
Yes. Dental research has found that tea causes more tooth staining than coffee, due to its higher tannin content. Given that tea is the UK's most popular hot drink, it is the most common cause of extrinsic tooth staining for British adults. Adding milk may help reduce the staining effect.
Can I get teeth whitening on the NHS?
Cosmetic teeth whitening is not available on the NHS. However, internal bleaching of a dead or discoloured tooth can be provided on the NHS under Band 2 (£75.30) if your dentist considers it clinically necessary. A cosmetic scale and polish to remove surface staining is also only available on the NHS when clinically necessary — otherwise you will need a private hygienist appointment.
