A dead or dying tooth is one where the soft tissue inside, the pulp, has lost its blood and nerve supply. The classic warning signs are a tooth that darkens to grey or brown, a change in pain that swings from severe to strangely quiet, and a gum that develops a small pimple or swelling nearby. The tricky part is that a dying tooth does not always hurt, so it can go unnoticed until infection sets in. Knowing what to look for means you can act before a small problem becomes an abscess.
Key takeaways
- A dead tooth has lost its internal nerve and blood supply, often after deep decay, a crack, or a knock.
- Common signs include darkening of a single tooth, on and off pain, a bad taste, or a bump on the gum.
- Pain that suddenly stops does not mean the tooth has healed. It can mean the nerve has died.
- Left untreated, a dead tooth can lead to a painful abscess and can affect the bone around the root.
- Root canal treatment or extraction are the two main ways to deal with it, and a discoloured tooth can often be lightened afterwards.
Why a tooth dies
Inside every tooth is a chamber of living tissue that keeps it healthy. Anything that lets bacteria reach that tissue, or that cuts off its blood supply, can cause it to die. The usual routes are:
- Deep decay. A cavity that reaches the pulp allows bacteria in, causing inflammation that can progress to nerve death. This is the stage beyond irreversible pulpitis.
- Trauma. A knock to a tooth, even years earlier, can damage the blood vessels at the root tip. Front teeth are especially prone.
- A crack or fracture. Deep cracks give bacteria a path to the pulp.
- Repeated dental work. A tooth that has had several large fillings or restorations over time can eventually give up its nerve.
The signs to watch for
A dying tooth can announce itself loudly or quietly. Look and feel for:
- Discolouration. A single tooth turning grey, brown, or yellowish while its neighbours stay bright is a strong clue. This differs from general staining because it affects one tooth from the inside.
- Pain that changes character. Sharp, throbbing pain that then fades to nothing over days can signal the nerve dying. Some people feel pressure or a dull ache instead.
- A pimple on the gum. A small bump, sometimes leaking a bad taste, is often a sign that infection is draining from the root.
- Swelling or tenderness. Around the tooth or in the nearby gum.
- Bad taste or odour. A persistent unpleasant taste can accompany a low-grade infection.
Some dead teeth cause none of these and are only found on a routine X-ray. That is one reason regular check-ups matter.
Why you should not wait it out
When pain from a dying tooth eases, it is tempting to assume the problem has passed. It usually has not. Once the pulp dies, bacteria can multiply in the empty canal and spread out through the root tip into the surrounding bone. That can form a dental abscess, which may cause facial swelling, fever, and significant pain. If you notice swelling that is spreading, difficulty swallowing, or a fever, treat it as urgent and follow the steps in our guide on what to do in a dental emergency.
How a dentist confirms it
Diagnosis is usually quick. A dentist may:
- Take an X-ray to look for changes at the root tip and in the surrounding bone
- Apply a cold or electric pulp test to see whether the nerve responds
- Tap gently on the tooth to check for tenderness
- Compare the colour and feel of the tooth with its neighbours
Treatment options
There are two main ways to deal with a dead tooth, and the right one depends on how much healthy tooth remains.
| Option | What it involves | When it suits |
|---|---|---|
| Root canal treatment | Removing the dead tissue, cleaning and sealing the canals, then restoring the tooth, often with a crown | When enough sound tooth remains to save |
| Extraction | Removing the tooth, with options to replace it later using an implant, bridge, or denture | When the tooth is too damaged or cracked to restore |
Deciding between them is a case by case call. Our guide to root canal versus extraction walks through the trade-offs. If a front tooth has already darkened, it can often be lightened from the inside afterwards using internal bleaching, so cosmetic appearance is usually recoverable. General costs for these treatments vary by clinic and complexity, and health fund rebates may apply.
Frequently asked questions
Can a dead tooth be saved?
Often, yes. Root canal treatment removes the dead tissue and lets you keep the tooth. Whether it can be saved depends on how much healthy structure is left.
Does a dead tooth always hurt?
No. Many dead teeth are painless, especially once the nerve has fully died. This is why a darkening tooth should be checked even if it does not ache.
How long can a dead tooth stay in your mouth?
It varies, but leaving it untreated risks infection and abscess. It is safer to have it assessed promptly rather than wait for symptoms.
Why has my tooth gone grey?
Greying of a single tooth usually reflects changes inside it after the nerve has died. Blood breakdown products can stain the tooth from within.
Is a dead tooth an emergency?
Not always, but it becomes urgent if there is spreading swelling, fever, or severe pain, which can signal a serious infection.
The bottom line
A tooth that darkens, aches on and off, or grows a bump on the gum nearby deserves a look, even if the pain has settled. Caught early, a dead tooth can usually be treated and often kept. The team at Lumi Dental can assess a discoloured or uncomfortable tooth and explain your options. See our current new patient offers to arrange a visit.
