Dark or Grey Tooth
Causes & Treatment
A single tooth that turns dark or grey is a change in colour that usually reflects something happening inside the tooth. It may develop gradually or follow a specific event such as an injury. A professional dental assessment can help identify the cause and determine appropriate management.
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Understanding the Condition
What Does It Mean When a Tooth Turns Dark or Grey?
A darkening or greying tooth most commonly reflects changes within the internal structure of the tooth rather than surface staining. Unlike external discolouration — which typically affects multiple teeth and is often related to diet, drinks or smoking — a single dark tooth usually has a specific underlying cause.
The colour change can vary from a subtle greyish hue to pronounced brown, yellow or almost black tones. It may develop gradually over months or years, or appear more quickly following events such as trauma, advanced decay or certain dental procedures. In many cases it is primarily a cosmetic concern, but in others it can indicate issues requiring clinical attention.
A thorough dental assessment — often including an X-ray — helps determine whether the discolouration is internal or external, whether the tooth remains vital, and what underlying factors may be involved. This information then guides the most appropriate management approach.
Symptoms & Signs
Visible darkening of a single tooth
A noticeable change in shade — often grey, brown or dark yellow — affecting one tooth while others remain unchanged
Colour difference vs. surrounding teeth
The affected tooth may stand out, especially under natural light or when smiling, even if the change has developed gradually
Sensitivity or discomfort
Some patients experience sensitivity to hot, cold or pressure, though in many cases the tooth remains entirely painless
History of trauma or dental work
The colour change may be linked to a previous injury, deep filling or root canal treatment, even if this occurred some time ago
No pain despite colour change
A tooth that has lost its nerve supply may appear dark yet feel normal — which is why professional assessment is important even without symptoms
Gum changes near the tooth
In some cases, a small swelling, spot or tenderness on the gum near the dark tooth may be noticed, which can indicate an underlying issue
Symptoms vary depending on the underlying cause. A dark tooth can be entirely painless, so assessment is recommended whenever a colour change is noticed.
Contributing Factors
Common Causes of a Dark or Grey Tooth
A single dark tooth may result from one or more underlying factors. Understanding the cause is essential to selecting the most appropriate management approach.
Trauma or injury
A blow or impact to the tooth can damage the blood vessels inside, leading to internal bleeding and gradual darkening — sometimes appearing weeks or months after the injury
Previous root canal treatment
Teeth that have undergone root canal therapy can darken over time as the internal tissues are no longer vital, occasionally producing a grey or yellowish appearance
Internal bleeding within the tooth
Damage to the pulp tissue can release pigments that seep into the dentine, staining the tooth from the inside and giving it a grey or pink hue
Tooth decay in deeper layers
Decay that progresses into the dentine can darken the tooth as infected tissue breaks down, sometimes appearing as a dark shadow beneath the enamel
Age-related changes
As enamel naturally thins with age, the underlying dentine — which is darker in colour — becomes more visible, though this usually affects multiple teeth rather than one
Dental materials
Certain older restorative materials, such as metal posts or amalgam fillings, can cause a greyish appearance as they interact with the surrounding tooth structure over time
Why It Matters
Potential Implications if Not Assessed
While some colour changes are primarily cosmetic, a dark or grey tooth can sometimes indicate an underlying issue that benefits from professional evaluation. In teeth affected by trauma or deep decay, the pulp tissue inside may have been damaged, and without assessment, problems such as infection or inflammation can develop without obvious symptoms.
If an underlying infection is present, it may progress silently and, in some cases, lead to a dental abscess or spread to surrounding tissues. The affected tooth may also become structurally weaker over time, particularly if a significant portion of the internal tooth structure has been lost through decay or previous treatment.
Beyond function, a darkening tooth can affect the appearance of the smile and, for some patients, impact confidence — particularly when it involves a front tooth. Early assessment helps identify the cause, determine whether the tooth remains healthy, and allow a range of management options to be considered before the condition progresses further.
Your Options
Treatment and Management Options
Management depends on the underlying cause, the health of the tooth and your individual goals. Your dentist will recommend the most appropriate option following a thorough clinical assessment.
Internal Whitening
For non-vital teeth that have darkened, internal whitening places a whitening agent inside the tooth to lighten it from within, often used following root canal treatment.
Learn MoreRoot Canal Treatment
If the tooth has an infection or damaged pulp tissue, root canal treatment can remove the affected material and help preserve the natural tooth structure.
Learn MoreComposite Bonding
Tooth-coloured resin can be applied to the front surface of a darkened tooth to mask the discolouration and restore a more natural appearance in suitable cases.
Learn MorePorcelain Veneers
Thin porcelain shells bonded to the front of the tooth can cover persistent internal discolouration and match the shade of surrounding teeth.
Learn MoreDental Crowns
Where the tooth has been structurally weakened — for example by previous root canal treatment or extensive decay — a crown can restore both appearance and strength.
Learn MoreMonitoring
In certain cases, particularly where colour change is mild and no infection is present, your dentist may recommend monitoring the tooth before deciding on any active treatment.
Learn MoreYour First Step
Importance of Professional Dental Assessment
A dark tooth may represent internal changes that are not always visible or painful. Because of this, professional evaluation is the most reliable way to determine whether the discolouration is cosmetic, functional, or a sign of an underlying problem requiring treatment.
During your assessment, your dentist will carry out a visual examination, review your dental and medical history, and may use tests such as tooth sensibility testing and X-rays to evaluate the internal structure, pulp status and surrounding bone. Photographs may also be taken to document shade and monitor any changes over time.
The findings will guide a personalised treatment plan. This may range from simple monitoring, through root canal treatment where appropriate, to cosmetic options such as composite bonding, veneers or a dental crown. Your dentist will explain all suitable options, expected outcomes and associated costs before any treatment begins.
What to Expect
- 1Visual examination and shade comparison with neighbouring teeth
- 2Review of dental history, including any previous trauma or treatment
- 3Tooth sensibility testing to assess nerve status
- 4X-rays where appropriate to evaluate the root and surrounding bone
- 5Clear explanation of all treatment options and associated costs
- 6Personalised management plan tailored to your individual needs
Two Convenient Locations
Visit Us in Central London
Assessment and treatment planning for dark teeth and other dental concerns are available at our London clinic, where professional evaluation can help determine appropriate care options.
South Kensington
Now Open20 Old Brompton Road, South Kensington, London SW7 3DL
Mon & Wed: 9 am – 6 pm
Tue & Thu: 9 am – 8 pm
Fri: 9 am – 5 pm
Sat & Sun: 10 am – 4 pm
1 min from South Kensington tube (District, Circle & Piccadilly)
City of London
Opening May 20265 Ave Maria Lane, City of London, London EC4M 7AQ
Mon – Fri: 8 am – 8 pm
Sat & Sun: Closed
3 min from St Paul's tube (Central line) · 5 min from Blackfriars
Common Questions
Dark Tooth FAQ
Your Dental Team
Experienced Dentists
All our dentists are GDC registered and experienced in diagnosing and managing tooth discolouration, providing personalised care for each patient.
Dr. Yasha Y Shirazi
Principal Dentist & Clinical Director
GDC: 195843
Dr. Reza Davari
Dentist
GDC: 302422
Dr. Kamran Yazdi
Dentist
GDC: 197926
Dr. Andreia Phipps
Dentist
GDC: 229601
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Our South Kensington clinic is regulated by the Care Quality Commission (CQC) and all our clinicians are registered with the General Dental Council (GDC).
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Assessment for Dark Tooth
Noticed a Tooth Turning Grey?
If you notice a tooth turning grey or darker than others, a professional dental assessment can help identify the cause and determine appropriate treatment options based on your individual needs.
