This is something patients ask me quite often. A tooth that has had root canal treatment can sometimes change colour over time. It may look grey, darker than the surrounding teeth, or slightly dull.
In most cases, this colour change is gradual. It is usually not painful, but it can affect confidence, especially if it involves a front tooth.
Why does a root canal tooth turn dark?
There are a few reasons why this can happen.
When a tooth needs root canal treatment, the nerve tissue inside has been damaged or infected. After treatment, the inner part of the tooth no longer has a blood supply. Over time, this can change how light passes through the tooth.
Other possible reasons include:
- Staining from materials previously used inside the tooth
- Breakdown products from the original nerve tissue
- Internal bleeding before treatment
- Changes in enamel and dentine structure
Not every root treated tooth will darken, but it is not unusual.
Is it a sign something is wrong?
In many cases, a root canal tooth turned dark does not mean the treatment has failed. If there are no symptoms such as pain or swelling, the change is often cosmetic rather than a health issue.
That said, it is always sensible to have the tooth checked. An assessment and, if needed, an x-ray can help confirm that everything is stable.
What are the treatment options?
The right approach depends on the individual tooth.
Internal whitening
In some cases, whitening can be carried out from inside the tooth. This is sometimes known as internal bleaching. It may help improve colour where the structure of the tooth is still strong.
Results can vary and it may not suit every situation.
Composite bonding
Bonding is rarely suitable but it may be suitable if only a very small change is required.
Porcelain restorations
If the colour difference is significant, or the tooth is structurally weakened, porcelain restorations may be considered. These can help improve both appearance and strength when carefully planned.
The aim is always to achieve a result that looks natural and in keeping with the rest of your smile.
A real example
In one recent case with Matt Dash Dentist in Edinburgh’s West End, a patient presented with discoloured front teeth following previous root canal treatment. After careful planning, porcelain restorations were placed to restore colour and balance.
The goal was not to make the teeth look artificially bright, but to help them blend naturally with the surrounding smile.
Before and after photographs can help show what may be achievable, while recognising that every case is different.
When to seek advice
If you have noticed that your root canal tooth turned dark, it is worth having it assessed. Early discussion can help clarify the cause and the options available.
You can arrange a complimentary e-consultation with award winning dentist Matt Dash to explore what may be suitable in your case.
Further information
For more information about cosmetic and restorative dental standards, you may find the British Academy of Cosmetic Dentistry helpful:
https://bacd.com/
