A baby tooth that turns grey after a fall usually means the tooth has been bruised or the nerve inside has been damaged, much like a bruise under a fingernail. It often appears about one to two weeks after the knock. In many cases the tooth settles and stays comfortable until it falls out naturally, but a grey tooth should still be checked so a dentist can watch it and make sure the adult tooth developing underneath is not affected. This guide explains why it happens and when to act.
Key takeaways
- Grey discolouration after a knock is common and usually shows up 1 to 2 weeks later.
- The colour comes from bleeding or nerve damage inside the tooth, not from the surface.
- Some teeth fade back toward normal, some stay grey, and some darken further. All three can be fine.
- A grey tooth with no pain or swelling is often watched rather than treated.
- Swelling, a gum pimple, pain or fever means the tooth needs to be seen promptly.
Why a knocked tooth turns grey
When a child falls and knocks a front tooth, the tiny blood vessels inside can tear. Blood pigments seep into the tooth from the inside and show through the enamel as a grey, brown or darker shade. This is the same process that turns a bruise purple. Sometimes the nerve recovers and blood flow returns, and the colour fades. Other times the nerve does not recover, and the tooth stays discoloured because it is no longer vital. Both outcomes are common with baby teeth, and a discoloured baby tooth is not automatically a dental emergency.
| What you see | What it may mean | Usual approach |
|---|---|---|
| Grey tinge appears within days to 2 weeks | Bruising and internal bleeding | Monitor, often fades or stabilises |
| Tooth stays grey, no other symptoms | Nerve has likely died but tooth is stable | Watch until it falls out naturally |
| Grey plus swelling, a gum pimple or pain | Possible infection | See a dentist promptly |
| Yellow tinge over time | The tooth has laid down extra internal dentine | Usually harmless, monitor |
Will the tooth get better?
It depends on how badly the nerve was affected. A mildly bruised tooth may return to a more normal colour over a few weeks as blood flow recovers. A tooth whose nerve has died will usually stay grey, but it can remain comfortable and functional for years until it is naturally replaced by the adult tooth. Because baby teeth are temporary, dentists often take a careful watch-and-wait approach rather than treating a discoloured but healthy tooth. What matters most is keeping an eye out for infection.
Warning signs to act on
Book a dental visit sooner rather than later if you notice any of these:
- A pimple-like bump on the gum above the tooth, which can signal a draining infection.
- Swelling of the gum, face or lip.
- Pain, tenderness when eating, or the tooth feeling loose after it had settled.
- Fever or your child seeming unwell.
These can point to an infection around the tooth, which our guide to dental abscess in children explains. If the fall also knocked the tooth loose or out, see our advice on a knocked-out baby tooth and a baby tooth pushed up into the gum.
Will it affect the adult tooth?
This is the question most parents have. A significant injury or an untreated infection in a baby tooth can occasionally affect the developing adult tooth beneath it, sometimes causing a mark or a change in its enamel when it comes through. This is uncommon, but it is exactly why a dentist likes to review a discoloured baby tooth and may take an X-ray. Our guide to when baby teeth fall out gives the normal timeline for the adult tooth arriving.
What you can do at home
Keep brushing the tooth gently and normally so it stays clean and healthy. Give softer foods for a few days if it is tender. Do not try to whiten or scrub the discolouration away, since the colour comes from inside the tooth. Keep the follow-up appointment even if the tooth looks settled, because monitoring is the whole point.
Frequently asked questions
How long after a fall does a tooth turn grey?
Usually about 1 to 2 weeks, though it can appear a little sooner or later. It is a delayed sign rather than an immediate one.
Does a grey baby tooth need to be removed?
Not usually. A grey but comfortable tooth is often left to fall out on its own. Removal is generally only considered if there is infection or the tooth is causing problems.
Can a grey baby tooth turn white again?
Sometimes. If the nerve recovers, the colour can fade toward normal. If the nerve has died, the tooth tends to stay discoloured, which is still often fine.
Is a grey baby tooth an emergency?
The colour alone is not an emergency. Swelling, a gum pimple, pain or fever are the signs that need prompt attention.
Should I still take my child to the dentist?
Yes. Even a settled grey tooth is worth a check so it can be monitored and the adult tooth underneath assessed if needed.
The bottom line
A grey baby tooth after a fall is common and often harmless, but it deserves a professional eye to rule out infection and keep watch on the adult tooth below. If your child has a discoloured tooth, or any swelling or pain, arrange a check. You can see current family offers on our offers page. This article is general information and not a substitute for advice from your dentist.
