Why teeth sometimes turn black

Black discolouration usually means something deeper is happening inside the tooth or on its surface. It can be caused by staining, decay, tartar buildup or changes to the tooth’s internal structure. Some causes are harmless, while others need quick attention.

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Common reasons teeth turn black

1. Deep staining from food, drink or smoking

Dark pigments from coffee, tea, red wine, tobacco and certain foods can build up over time and create black patches.

2. Tartar buildup

When plaque hardens into tartar, it can appear dark brown or black — especially around the gumline.

3. Tooth decay

As decay progresses, the tooth structure breaks down and can turn dark or black.

4. Old fillings or dental work

Metal fillings or crowns can leak or oxidise, causing the surrounding tooth to darken.

5. Trauma to the tooth

A tooth that’s been injured may lose blood supply, causing the inside to darken over time.

6. Medication or mouthwash staining

Certain mouthwashes containing chlorhexidine can cause dark surface staining.

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Types of black discolouration

How to treat black teeth

Professional cleaning

Removes tartar and deep surface staining.

Whitening treatments

Brighten teeth affected by external staining.

Fillings or crowns

Used when decay has damaged the tooth structure.

Root canal treatment

Needed if the tooth has died due to trauma or infection.

Replacing old fillings

Modern materials blend naturally with your tooth colour.

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When black teeth need urgent attention

Pain or sensitivity

Could indicate decay or infection.

Black spots that grow

Often a sign of active decay.

Bad breath that doesn’t improve

May be linked to tartar or deep decay.

A tooth turning black after injury

Could mean the nerve has died.

If you notice any of these, a dentist should review the tooth quickly.

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How Toothfairy helps with black teeth

Photo‑based assessments

Upload images to find out whether the discolouration is staining, tartar or decay.

Dentist‑led advice

Clear guidance on whether whitening, cleaning or treatment is needed.

Support for urgent concerns

If the tooth looks infected or damaged, you’ll get fast next‑step advice.

Clear next steps

Know whether you can manage the issue at home or need an in‑person visit.