Crown lifespan is one of those things that genuinely varies. Some crowns last ten years, some last thirty. A lot depends on the material, how well it was fitted, the forces that tooth takes, and, frankly, how well the patient looks after it. But at some point, most crowns do need replacing. Knowing the signs helps.
Sensitivity That Wasn’t There Before
New or increasing sensitivity in a crowned tooth is worth paying attention to. The crown itself (assuming it’s properly fitted) doesn’t feel anything, but the tooth underneath still has a root, and if something’s gone wrong at the margin where crown meets tooth, bacteria can get in. That leads to decay under the crown, which can cause anything from mild sensitivity to real pain.
Heat sensitivity that lingers for more than a few seconds, or sharp pain when biting, can indicate that the tooth beneath the crown is in trouble. That’s not always the crown’s fault, but it’s usually a sign the crown needs to come off so the underlying tooth can be assessed. And the longer you leave it, the more likely you are to end up needing root canal treatment or, worse, losing the tooth entirely.
Visible Damage to the Crown
Obvious, perhaps. But some damage is subtler than a crack you can see in the mirror. Porcelain crowns, particularly older ones, can chip or fracture in ways that aren’t immediately painful. Some patients only notice it when their tongue finds a rough edge. Others spot it in a photo.
Even a small chip can compromise a crown’s function and, more importantly, its seal. Once the seal between crown and tooth is broken, that margin becomes a trap for bacteria. Decay follows. Not always quickly, but reliably.
Metal crowns don’t chip in the same way, but they can corrode over time, particularly at the margin. If you’ve had a crown for more than fifteen years and it’s starting to look dark at the gumline, that dark line isn’t just cosmetic. It may be the metal showing through as the porcelain wears, or it could be a sign of receding gum tissue and an exposed margin.
Pain When Biting Down
Pain on biting is one of the clearer signals that something isn’t right. Well, mostly. Sometimes it’s a bite issue rather than a crown problem, meaning the crown is sitting slightly high and just needs adjustment. That’s a simple fix. But if pain persists after the bite has been checked and adjusted, something else is going on.
A cracked underlying tooth, decay beneath the crown, or a fracture in the crown itself can all cause bite pain. The only way to know for certain is a proper examination, sometimes with X-rays to see what’s happening below the gumline. Worth knowing: not everything shows clearly on a standard X-ray, so a good clinical examination matters just as much.
Gum Problems Around the Crown
Healthy gums sit snugly around a well-fitted crown. If the gum around a crowned tooth becomes red, swollen, or bleeds consistently when you brush, it’s worth investigating. Some patients assume this is just a gum hygiene issue. Sometimes it is. But it can also indicate that the crown margin isn’t fitting properly, creating a ledge or gap where plaque accumulates.
An overhanging margin is a common cause of localised gum disease around crowns, and it’s something that develops over time as gum tissue changes. Crowns fitted perfectly a decade ago may not sit flush with the gum anymore, simply because gum levels shift. In these cases, a replacement crown with an updated margin can make a real difference to gum health.
| Sign | Possible Cause | Action Needed |
|---|---|---|
| Sensitivity to temperature | Decay under crown or exposed root | Assessment and X-ray |
| Pain on biting | High bite, crack, or failing crown | Examination; possible replacement |
| Visible chip or crack | Material fatigue or trauma | Repair or replacement |
| Gum swelling or bleeding | Poor margin fit, plaque trap | Hygiene review and crown assessment |
| Crown feels loose | Cement failure | Re-cementation or replacement |
A Crown That Feels Loose
Cement failure. It happens, especially in crowns that have been in place for many years. You’ll notice a slight rocking sensation when biting, or the crown may feel like it moves if you push it with your tongue. Don’t ignore this one.
A loose crown is an open invitation for bacteria to get underneath. If you catch it early, the crown can often be cleaned and re-cemented without any further work. But if the tooth has decayed in the meantime, re-cementation may not be possible, and a new crown, or something more involved, becomes necessary. Some patients put up with a loose crown for months because it isn’t painful. That’s understandable but genuinely not worth the risk.
The Crown Is Simply Old
There’s no precise answer to how long a crown should last. Somewhere between ten and twenty-five years is a reasonable range for most well-maintained crowns, with considerable variation at both ends. Some older all-metal crowns are still going strong at thirty years. Some porcelain-fused-to-metal crowns start showing problems at eight.
In practice, a crown that’s been in place for over fifteen years deserves regular monitoring, even if it’s not causing any symptoms. X-rays at routine appointments can catch problems before they become serious. And the crown material matters too. Older crowns with a metal substructure may look fine superficially but have issues developing underneath that only imaging will reveal.
Changes in Your Bite or Jaw
Teeth shift. Slowly, usually, but they do move over time, and so do the forces on each tooth. A crown that was perfectly balanced when it was placed may, over years, end up absorbing more pressure than it should as surrounding teeth move. This can accelerate wear on the crown material and, in some cases, lead to cracking.
But here’s the thing: your jaw joint changes over time too. Patients who grind or clench their teeth put significantly more stress on crowns than those who don’t. If you’ve been told you grind and you have older crowns, it’s worth having them checked regularly. A well-made night guard can extend crown lifespan considerably.
When Replacement Is Definitely Needed
Not every worn or ageing crown needs replacing immediately. Some decay under a crown, and if the decay isn’t too extensive, it may be possible to treat and re-crown. Others can be repaired rather than replaced outright. But replacement is unavoidable if the underlying tooth has fractured significantly, if there’s extensive decay that’s compromised the tooth structure, or if the crown is causing persistent gum problems that hygiene alone can’t resolve.
Your dentist should be honest with you about which scenario you’re in. In fairness, the conversation about whether a tooth is worth crowning again or whether extraction and an implant makes more sense isn’t always straightforward, but it’s one worth having before work begins.
Can a Crown Be Repaired Rather Than Replaced?
Sometimes. Not always. Small chips to porcelain crowns can occasionally be smoothed or built up with composite resin, particularly if the underlying structure is sound and the margin is still intact. It’s not a perfect fix, and composite repairs on porcelain do tend to discolour over a few years, but for a chip on a back tooth that isn’t causing any problems, it can be a reasonable interim approach rather than committing to a full replacement straight away.
Re-cementation is another option when the crown itself is in good condition but has simply come loose due to cement failure. If the crown is removed cleanly, the underlying tooth is healthy, and the crown still fits well, there’s no reason it can’t go back in. This is one of those situations where getting to the dentist quickly matters, because the longer a crown sits out of place, the more the surrounding teeth and the prepared tooth itself can shift. Waiting a few weeks to see if it sorts itself out is not a strategy.
But there are limits. A crown that’s fractured through its full thickness, one that’s leaked badly enough for decay to compromise the remaining tooth structure underneath, or one that was never a good fit to begin with: these aren’t candidates for repair. And in practice, a crown that’s showing multiple signs of failure at once, loose and chipped and with gum issues around the margin, is usually better replaced properly than patched repeatedly. Patchwork only gets you so far.
Getting It Checked
If any of these signs sound familiar, don’t wait for things to get worse. Our team at dental crowns in Dreghorn carries out thorough assessments of existing crowns, including X-rays where needed, and can give you a clear recommendation on whether yours needs replacing or just monitoring.
If you’re not sure about the current state of a crown, or if something has changed that you can’t quite put your finger on, get it looked at. StormDental is here to help. Call us on 01294 218 733 and we’ll get you in for an assessment.
