Dead Tooth: Signs, Causes, and Treatment Costs in the UK

A tooth is actually alive. Most people think of teeth as just hard mineral structures sitting in the jaw, but each one has a little living core inside called the pulp: blood vessels, nerve fibres, connective tissue. The blood supply enters through tiny openings at the tip of each root and feeds the tooth from the inside. The nerve is what lets you feel temperature and pressure. The whole thing is genuinely a remarkable bit of biology when you think about it, a miniature organ sitting quietly in the jawbone, doing its job for decades without asking for anything.

When that blood supply gets cut off or the pulp dies, the tooth itself dies with it. The mineral structure stays where it is, still looks like a tooth, still occupies its place in your mouth, still has the same shape. But the living tissue inside is gone, and that does change what happens next.

The genuinely good news upfront, though: a dead tooth is a very treatable problem. You can almost always keep the tooth, we can sort the cosmetics if it's gone dark, and we can clear any infection that's developed. So if you're reading this because you suspect one of your teeth might be dead, the answer isn't "it's done", it's "let's have a look and sort it out."

What Causes a Tooth to Die

Teeth die for a few reasons, and which one applies sometimes shapes how we approach it.

The most common cause, by quite a margin, is just untreated decay reaching the nerve. The cavity progresses through the enamel, through the dentine, and eventually breaks into the pulp chamber where the living tissue is. Once bacteria from the cavity invade that pulp, the immune response tries to fight off the infection in a tiny enclosed space with nowhere to drain. The inflammation and bacterial damage overwhelm the pulp tissue, it dies, and an abscess forms at the root tip as the infection spills out into the surrounding bone. It's the frustrating-to-prevent route, honestly, because a small cavity that could've been sorted with a £149 filling instead becomes a £600 to £1,400 root canal once it's reached the nerve.

Trauma is the next most common cause. A blow to the face, a fall, a sports collision, sometimes even a particularly hard bite on something unexpected. The force damages the tiny blood vessels that enter through the root tip. Those vessels tear, the blood supply gets interrupted, and the pulp tissue, starved of oxygen and nutrients, slowly dies off.

Here's the genuinely wild part about trauma: it can play out over years. A tooth that took a hard knock during a rugby match at seventeen might look completely fine for the next decade. Then at twenty-eight, it starts to darken. The damage was done years ago. The pulp's been quietly dying that whole time, and the colour change is just the moment you finally see what's been happening on the inside.

Then there are teeth that have had a lot of dental work over the years (large fillings, crowns, repeated restorations), which can wear the pulp out cumulatively. Every time a tooth is drilled, the pulp absorbs the vibration and the heat and the proximity of the work. Most teeth handle this remarkably well, but some, especially those with very deep fillings or a long history of multiple restorations, eventually develop irreversible inflammation that progresses to pulp death. A tooth with pain after a filling that won't settle within a few weeks may be heading in this direction.

How to Tell If a Tooth Is Dead

There are a few signs to look for, and any one of them on its own is enough to be worth getting checked.

The most obvious is colour change. A dead tooth gradually shifts from its natural shade toward grey, yellow-brown, or dark grey. What's actually happening is that the breakdown products of the dead pulp tissue, along with the blood that was trapped in the tooth when the vessels ruptured, are slowly permeating the dentine and darkening it from the inside out. The tooth is essentially staining itself with its own history. The change is gradual, often months or years, starting as a subtle difference from the teeth either side and progressing to something obvious. On a front tooth the change is immediately visible. On a back tooth it can go unnoticed for years.

The pain pattern is also distinctive once you know what to listen for. A dying tooth can be intensely painful at first. The inflammation of the pulp before it fully dies (called pulpitis) produces a deep throbbing severe toothache that barely responds to painkillers. Sharp pain to hot or cold, lingering for minutes after the stimulus is removed. This is the tooth actually in the process of dying.

Then something genuinely strange happens. Once the pulp is completely dead, the tooth can go quiet. The nerve that was producing all that pain doesn't exist anymore. The pain-free period feels like good news, and that's exactly what makes it tricky. The agony has stopped, so the problem must have resolved. It hasn't. The dead tissue inside the tooth is now a breeding ground for bacteria, and an abscess is quietly forming at the root tip. When the abscess builds enough pressure, pain comes back, but it's a different kind of pain: deeper, duller, centred on the root tip rather than the tooth itself. The gum may swell. The tooth becomes tender to bite on.

The third sign is something we test for at the appointment: a dead tooth doesn't react to temperature. During the cold spray test (a standard diagnostic where the dentist applies a freezing cold cotton pellet to the tooth), the adjacent living teeth respond normally and the dead tooth produces zero sensation. If a tooth that used to react to cold no longer responds, and the teeth on either side still do, the pulp has died.

Treating a Dead Tooth

Most dead teeth can be saved, which is the really reassuring bit. The two main routes are root canal treatment or extraction, and the choice between them comes down to how much viable tooth structure is left and what the long-term prognosis looks like.

Root canal treatment is by far the more common route, and it's worth understanding what it actually does. We remove the dead pulp tissue from inside the tooth, clean and disinfect the canal system thoroughly, and then seal it with a filling material. The tooth stays in your mouth, still occupying its position in the arch, still functioning for chewing. It's a bit like replacing the engine in a car with a solid block: the car still drives perfectly, it just doesn't have the original machinery inside anymore. At UrgentCare Dental, root canal pricing depends on the tooth (front teeth have one canal, back molars have three or four), running £399 to £950 per canal.

After the root canal, the tooth typically needs a crown on top. Removing the dead pulp and creating the access cavity (the small hole drilled to reach the canals) leaves the tooth structurally weaker than it was, and a crown restores the strength and protects against fracture down the line. Crowns at UrgentCare Dental are £650 to £895. For darkened front teeth specifically, the crown handles the cosmetics in the same go: a porcelain crown in the right shade covers the discolouration entirely. Internal bleaching (placing a whitening agent inside the tooth after the root canal) is another option for moderate discolouration if you'd rather keep more of the original tooth showing.

Root canal treatment has a success rate of around 90 to 95% for initial treatment. The tooth can comfortably function for decades afterwards, and plenty of root-treated teeth last a lifetime.

If the tooth is too damaged to save (extensive decay, a vertical root fracture, severe bone loss around the roots), extraction is the way forward. That sits at £149 for a simple extraction, £399 for surgical, or £549 for more complex cases at UrgentCare Dental. The gap is then addressed with an implant (from £1,999), a bridge, or a denture. Worth knowing that an implant ends up costing less than a series of bridges over a 30-year horizon, and works better in daily use too.

What Happens If You Leave It

A dead tooth left alone doesn't just sit there quietly being dead. The dead tissue inside becomes a really attractive home for bacteria. They colonise the pulp chamber and root canals, the infection escapes through the root tip into the surrounding bone, and an abscess develops.

Sometimes that abscess is chronic: a slow grumbling infection that periodically drains through a small gum boil, produces an intermittent bad taste, but minimal pain. People often learn to live with it, and that's actually what makes it more dangerous, because the pain isn't urgent enough to force action while the infection's still very much active. Other times it's acute, a sudden painful swelling that makes it very clear something needs sorting that day.

Either way, the infection is active under the surface. The bone around the root tip is being destroyed slowly, and the longer it continues, the more bone gradually disappears. That bone loss can eventually narrow your options for implant placement later if the tooth does end up needing extraction, which means delaying isn't just delaying. It can actually compromise the choices that are available to you later on.

A darkened or symptomatic tooth doesn't improve on its own. The discolouration deepens. The infection progresses. The bone slowly disappears. It's one of those situations where the right action really does just want to happen reasonably soon.

Come In and Let's Have a Look

At UrgentCare Dental, a dead tooth assessment includes the cold test (to check if the tooth responds to temperature), an X-ray (which shows any abscess at the root tip and gives us a clear view of the tooth structure and surrounding bone), and a clinical examination. Together these tell us whether root canal treatment can save the tooth and what the full plan looks like from there.

Emergency appointments are £20 for anyone with active symptoms (pain, swelling, or a tooth that's recently changed colour). The assessment moves straight into treatment planning, and same-day treatment is available for urgent cases. All of it's available on 0% finance over 12 months, which makes spreading any larger costs into manageable monthly payments very easy.

A dead tooth is a properly treatable problem. The tooth can almost always be saved, the infection resolved, and the cosmetics sorted. The whole thing starts with an assessment that tells you exactly where things stand, no surprises.