A dark tooth after a root canal: why it happens and how to fix it
In short: a tooth going darker after a root canal is very normal: with no nerve, it loses its blood supply and gradually changes tone. It doesn’t mean the root canal went wrong; it’s an aesthetic issue that has a solution: from internal whitening to a veneer or crown, depending on the case.
Why does it darken?
A living tooth receives blood supply inside. When a root canal is done and the nerve removed, that tooth stops “feeding” itself and, over months or years, loses its shine and turns grey or yellow. It’s a slow change and only affects that tooth, which is why it stands out next to the others.
Does it mean something is wrong?
Not necessarily. The darkening is mostly aesthetic. The root canal can be perfect and the tooth healthy inside. Even so it’s worth checking, because a root-treated tooth sometimes needs protecting with a crown (especially molars), and the colour gets sorted at the same time.
How is it fixed?
Depending on the case:
- Internal whitening: when it’s just one tooth, it’s whitened from the inside. It’s the most conservative option and usually gives a great result.
- Veneer: if the change is large or you also want to improve the shape, a veneer covers it.
- Crown: if the tooth was left very weakened, a crown restores colour and strength at once.
(Note: regular whitening of the whole mouth doesn’t usually match a root-treated tooth; that’s why it’s treated separately.)
When should I go?
When it bothers you aesthetically or a check-up shows the tooth should be protected. There’s no rush, but the sooner it’s assessed, the more conservative options there are.
Got a tooth that’s darker than the rest after a root canal? Come in and we’ll tell you which option suits you, with a fixed quote. The first visit is free: book an appointment.
Frequently asked questions
Why does a tooth darken after a root canal?
Because when the nerve is removed, the tooth stops receiving blood supply and, over time, tends to lose its shine and take on a greyer or more yellowish tone. It's an aesthetic change; it doesn't mean the root canal has failed.
Can a root-treated tooth be whitened again?
Yes. When it's just one tooth, internal whitening (from inside the tooth itself) is usually done, with very good results. If the change is large or the tooth is very weakened, sometimes a veneer or a crown is chosen instead.
Is it urgent to fix a darkened tooth?
Aesthetically it's not urgent, but it's worth checking: a dark tooth sometimes also needs a crown to protect it, especially if it's a molar or was left very weakened. The dentist assesses colour and strength at the same time.
Can we help with your case?
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