A non-living tooth often shows darkening color, bite pain, gum swelling, or a toothache that stops and then returns with pressure.
A dead tooth means the pulp inside the tooth has lost its living tissue. That pulp holds nerves and blood vessels, so when it dies the tooth can change color, stop reacting to cold, and start hurting when you bite.
The tricky part is this: not every dead tooth hurts all the time. Some ache for days, then go oddly quiet. That lull can fool people into waiting, even while infection keeps building near the root.
How Do You Know If A Tooth Is Dead? What Dentists Check
Dentists do not call it by color alone. They piece together your story, what the tooth feels like, how it reacts to cold or tapping, and what an X-ray shows around the root.
Clues You Can Notice At Home
One clue on its own is not enough. A dead tooth usually shows a pattern, not a single dramatic sign.
- A tooth turns gray, brown, or dull yellow compared with the tooth beside it.
- Pain lasts after hot or cold, then later the tooth may stop reacting at all.
- Biting down or letting go of a bite causes a sharp ache.
- A pimple-like bump on the gum appears near the root.
- Bad taste, bad smell, or drainage shows up now and then.
- Swelling in the gum, cheek, or jaw starts.
- The tooth was hit, cracked, or heavily filled in the past.
That last point matters. A tooth can lose its pulp long after a sports hit, fall, or crack. You may not connect the old injury to the trouble you feel today.
Why Pain Can Fade For A While
When the pulp is inflamed, heat, cold, sweets, or brushing can set off pain. Then, once the pulp dies, the pain can ease for hours, days, or longer. That does not mean the tooth healed. It can mean the nerve tissue is gone and the trouble has shifted to the root tip.
The MSD Manual’s “Toothache and Infection” page notes that pain can linger with pulpitis, then stop briefly after the pulp becomes necrotic. The MedlinePlus tooth abscess page also notes that pain can stop when pressure drops, even while the infection stays active.
What Usually Kills The Pulp
Most dead teeth start with one of four problems: deep decay, a crack, a hard hit, or repeated work on the same tooth. Each one can cut off the pulp from its blood flow or let bacteria reach it.
Decay is the usual driver. A crack can do it too, even when the tooth looks fine from the outside. Trauma is sneaky: a tooth can darken months or years after a blow. Big old fillings can also stress the pulp over time, mainly if the tooth has already had a rough run.
| Sign | What It May Point To | What A Dentist Often Checks |
|---|---|---|
| Dark gray or brown color | Pulp no longer living or old trauma change | Color match with nearby tooth and X-ray |
| Pain that lingers after hot or cold | Deep pulp irritation that can lead to pulp death | Cold test and symptom history |
| No cold response at all | Non-living pulp or an old root canal tooth | Cold or electric pulp test and X-ray |
| Sharp pain on biting | Root tip irritation, crack, or abscess | Bite test, tapping, and X-ray |
| Gum pimple near the tooth | Drainage from infection at the root tip | Gum exam and X-ray |
| Bad taste or drainage | Leaking infection | Gum exam and tracing the source |
| Swelling of gum, cheek, or jaw | Spreading infection | Urgent exam, X-ray, and drainage plan |
| Old hit, crack, or deep filling | Pulp damage over time | History, pulp tests, and X-ray |
Dead Tooth Signs That Need A Dental Visit Soon
If the tooth is dark, tender to bite, or paired with a gum bump, book a dentist visit soon. Waiting raises the odds that the infection will move into the gum and bone around the root.
The NHS root canal treatment page says treatment removes infection from inside the tooth, then cleans and seals the space so it does not get infected again.
How A Dead Tooth Differs From A Badly Irritated Tooth
An irritated tooth still has living pulp. It often reacts to cold, sweets, or air. The pain may settle once the trigger is gone. A dead tooth can do the opposite: it may stop reacting to cold, darken, and hurt more when you tap it or chew.
Dentists sort this out with a cold test, a gentle tap test, bite checks, and dental X-rays. Some also use an electric pulp test. You cannot confirm a dead tooth with a mirror alone.
| Finding | Usual Next Step | What That Can Mean For The Tooth |
|---|---|---|
| Dead pulp with enough tooth left | Root canal and final filling or crown | The tooth often stays in place |
| Dead pulp with swelling or drainage | Urgent dental care, then root canal or removal | Speed matters more than waiting for it to “settle” |
| Deep crack running into the root | Removal is often the better path | Root canal may not fix the source |
| Tooth too broken down to rebuild | Removal, then replacement planning if needed | Keeping the tooth may not be realistic |
| Old injury with dark color but no pain | Pulp tests and X-ray before any drilling | The tooth may still need treatment |
What The Dentist May Do Next
Treatment depends on how much healthy tooth is left, whether the root is cracked, and whether infection has spread beyond the tooth.
What The Tests Can Show
A cold test asks whether the nerve tissue still reacts. Tapping checks whether the tissues around the root are sore. A bite test can tease out a crack that only hurts under pressure. An X-ray can show deep decay, a dark area near the root, bone change, or old trauma.
No single test settles it every time. Dentists read the whole picture together: your symptoms, the timing, the tooth color, the gum, the X-ray, and how the tooth responds chairside.
Root Canal Or Removal?
Root Canal
If the tooth can still be rebuilt, a root canal is often the first choice. The dentist removes the dead or infected pulp, cleans the inside space, fills it, and seals it. Then the tooth is rebuilt with a filling or crown so it can handle chewing again.
Removal
If the crack runs too deep, the tooth is split, or too much structure is gone, removal may be the better fit. That ends the source, but it also leaves a gap that may need a bridge, denture, or implant later.
Antibiotics are not the whole fix for a dead tooth. They may be used when swelling, fever, or spread shows up, yet the source still needs dental treatment.
When It Is Urgent
Do not wait days hoping it will blow over if any of these are happening:
- Swelling in the cheek, jaw, or gum
- Fever or feeling ill with tooth pain
- A pimple on the gum with a bad taste in your mouth
- Pain that keeps you awake or gets worse when you bite
- Trouble swallowing, trouble opening your mouth, or swelling that is spreading
Those signs can mean the infection is moving past the tooth. Same-day dental care is wise. Emergency care is the safer call if swelling is spreading or swallowing gets hard.
What You Can Do Before The Appointment
Use the other side to chew. Rinse with warm salt water if the gum is sore. Take your usual pain relief if you can use it safely. Do not place aspirin on the tooth or gum; it can burn the tissue.
Skip the wait-and-see game just because the pain backed off. That pause can happen after the pulp dies. If the tooth is dark, feels dead to cold, hurts on bite, or grows a gum pimple, the right move is a dental exam.
The clean pattern is this: a tooth that darkens, stops feeling cold, hurts on bite, or grows a gum pimple needs a dentist, not guesswork. A dead tooth can often be kept when it is treated early. Leave it alone, and the trouble tends to move deeper, not fade out.
References & Sources
- MSD Manual Professional Edition.“Toothache and Infection.”Shows how pulp pain can linger, then stop briefly after necrosis, and lists discoloration after trauma.
- MedlinePlus.“Tooth abscess.”Shows that pain can stop when pressure drops even while infection stays active, and lists swelling, gum bumps, and treatment notes.
- NHS.“Root canal treatment.”Shows when root canal care is used and how the tooth is cleaned, filled, and sealed.