How Long Do Dental Crowns Last, and What Makes Them Fail?

Most dental crowns last 10 to 15 years, and plenty carry on well past 20. But there's a detail that surprises almost everyone: when a crown "fails," the crown itself is usually still fine. It's the tooth underneath that's given way.

That distinction matters, because it changes what you should be watching for and it changes how long a crown actually lasts in your mouth. So let's go through the real numbers, the reasons crowns give out, and the warning signs that mean yours deserves a look.

How Long Do Dental Crowns Last on Average?

A well-made crown on a healthy tooth has better than a 90% chance of still doing its job after 10 years. Over shorter timeframes the research is stronger again.

A 2026 systematic review pooled 64 studies covering more than 11,500 tooth-supported single crowns and put five-year survival at these levels (published in the dental literature on PubMed):

Crown material	Five-year survival	What we typically see in practice
Monolithic lithium disilicate (often sold as e.max)	About 98.5%	15 years or more
Zirconia, veneered and densely sintered	About 97%	15 to 20 years
Porcelain fused to metal (PFM)	About 95%	10 to 20 years
Gold and metal alloy	Comparable to PFM	20 years and beyond
Older feldspathic porcelain	Lower than all of the above	5 to 15 years

Two things are worth pulling out of that table.

The gap between modern materials at five years is small. Nearly everything currently used sits in the mid-90s or better, and the real differences only show up at the 10 and 15 year marks.

The second point is about construction rather than material. Monolithic crowns, milled from one solid block, chip far less often than veneered crowns, where a layer of cosmetic porcelain is fired over a stronger core. That outer layer is usually the bit that flakes.

Gold deserves a mention even though hardly anyone asks for it now. For a back molar in a heavy grinder, it's still one of the toughest options dentistry has. Not pretty. Very hard to break.

Do Crowns Last Longer on Front Teeth or Back Teeth?

Crowns on front teeth generally last longer than crowns on molars, and it comes down to force.

Your back teeth generate the heaviest bite load in your mouth, thousands of cycles a year, every meal and every clench. A crown on a lower first molar is doing hard labour. A crown on an upper lateral incisor is mostly along for the ride.

But front crowns fail for a different reason: appearance. Gums recede a little over the years and can expose a thin dark line at the edge, or the shade stops matching the teeth either side as those teeth pick up stain. The crown still works perfectly well. It just stops looking right, and on a front tooth that's reason enough to replace it.

What Actually Makes a Dental Crown Fail?

Crowns rarely fail because the porcelain broke. In the research, the leading causes are biological rather than mechanical, and nearly all of them happen at the join between the crown and your natural tooth.

Decay at the crown margin

This is the single most common reason. The edge of a crown sits right at or just below the gum line, and that junction collects plaque. If it isn't cleaned properly, decay starts in the natural tooth just under the rim.

The awkward part is that you usually can't see it and it doesn't hurt until it's well advanced. It turns up as a shadow under the crown edge on a check-up x-ray, which is a large part of why we take routine dental x-rays on crowned teeth. If you want to know what decay looks like elsewhere in the mouth, our guide to the early signs of tooth decay covers it.

The crown coming loose

Cement doesn't last forever. Over enough years it can wash out or break down, and the crown lifts by a fraction of a millimetre. Patients describe a clicking feeling, or a bad taste, or food packing around one particular tooth.

A loose crown needs attention quickly even though it rarely hurts. Once the seal has gone, saliva and bacteria sit underneath it, and decay moves fast in a dark sealed space. Recementing early is often simple. Leaving it six months frequently isn't.

Chipping and fracture

Porcelain chips. Sometimes from biting something you shouldn't have (ice, olive pits, a pen lid), but far more often from grinding.

Grinding is the big one. Roughly half the cracked and worn restorations we see at Bradbury Dental Surgery trace back to night-time clenching the patient had no idea was happening. We go through the practical fixes in our guide on how to manage teeth grinding naturally.

The nerve dying underneath

A tooth that needs a crown has usually already been through a lot: deep decay, a large old filling, a fracture. Preparing it for a crown adds more stress. Months or years later, the nerve inside can give up.

That doesn't automatically mean the crown has to come off. In many cases root canal treatment can be done through a small access hole in the biting surface, which is then sealed.

Gum recession

When gums recede, the crown margin becomes exposed and root surface is left open. Root surface is softer than enamel and decays faster, so on a back tooth this is a genuine risk rather than a cosmetic one. On a front tooth it shows as that dark line at the gum.

What Are the Signs Your Crown Needs Replacing?

Six things worth getting checked:

1. A dark line at the gum edge. Could be an exposed metal margin, could be decay.

2. Food consistently packing around one crowned tooth. Often the first sign the fit or the contact point has changed.

3. Sensitivity to cold or sweet. A crown has no nerve of its own, so sensitivity means something is reaching the tooth underneath.

4. A clicking or shifting feeling when you bite. Treat as a loose crown until proven otherwise.

5. A visible chip, or a rough patch you can feel with your tongue.

6. Gum that's puffy or bleeds around that one tooth while the rest of your gums are healthy.

And one that catches people out. If a crowned tooth was sensitive for a while and then suddenly stopped, that isn't always a sign of healing. Sometimes it means the nerve has died. Patients quite reasonably read it as the problem sorting itself out and delay coming in, and by then there can be an infection developing at the root tip.

None of these means your crown is definitely failing. All of them mean it deserves a look at your next dental check-up.

How Long Do Crowns Last After a Root Canal or on an Implant?

Crowns on root canal treated teeth tend to last a little less than crowns on live teeth, and the reason is structural rather than mysterious.

Root canal treated teeth aren't more brittle in the way people assume. By the time a tooth needs a root canal, a lot of it has already been lost to decay or fracture, and less tooth means less for the crown to grip. If you're at that stage, our guide on what's normal after a root canal is worth reading.

Implant crowns work differently again. The implant post itself can serve for decades. The crown sitting on top is a separate component with its own lifespan, commonly 10 to 15 years, and it can usually be replaced without disturbing the implant underneath. Useful to know before anyone tells you dental implants are a one-and-done.

Do Crowns or Veneers Last Longer?

Crowns generally last longer than veneers, although the two aren't really competing for the same job.

	Crown	Veneer
Covers	The whole tooth	The front surface only
Typical lifespan	10 to 20 years	10 to 15 years
Natural tooth removed	Significant	Minimal
Suited to	Damaged, cracked or heavily filled teeth	Cosmetic changes to structurally sound teeth

A crown holds up better because it's thicker and it wraps the whole tooth. A veneer keeps more of your natural tooth. If the tooth is sound and the concern is purely how it looks, veneers are usually the more conservative call.

How Can You Make a Dental Crown Last Longer?

Nearly everything that shortens crown life happens at the margin, so that's where your effort should go.

Floss the crowned tooth properly, and mean it. Take the floss down to the gum, curve it around the tooth, and slide it slightly under the gum edge on both sides. Skimming between the teeth doesn't reach the part that matters. Interdental brushes do the job well too, and plenty of patients find them easier to use properly than floss.

If you grind, get a splint made. This is the single biggest thing within your control. A custom occlusal splint costs a fraction of a replacement crown, and it protects your other teeth at the same time.

Then the obvious ones. Don't chew ice. Keep your teeth off packaging and pen lids. And hold onto your check-ups, because decay under a crown gets picked up on an x-ray long before you'd ever feel it.

What Happens When a Crown Needs Replacing?

Replacing a crown means removing the old one, cleaning out any decay beneath it, rebuilding the core of the tooth if needed, and fitting a new crown. Two visits, usually.

Two things Australian patients should know before that point arrives, because most articles on this topic skip them entirely.

First, how the health funds treat it. Crowns fall under major dental on extras cover, which almost always carries a 12 month waiting period. If you're planning to switch funds or upgrade your level of cover, do it well before you need the work rather than after. Annual limits matter too: most extras policies cap out somewhere between $1,000 and $2,500 a year, and a single crown can absorb most of that. Where a replacement isn't urgent, timing the two appointments either side of your limit reset can make a real difference to what you pay. Some funds also apply loyalty limits that lift your benefit after several years of continuous cover, so ring them and ask rather than guessing. Our payment plan options can cover the gap where needed.

Second, a new crown isn't always the answer. If enough sound tooth is left once the old crown comes off, an onlay is sometimes enough, and it keeps more of your natural tooth structure. We compare the options in our guide to inlays, onlays and crowns. Nobody can tell you which applies until the old crown is off and they can see what's underneath.

So, how long does a dental crown last? Longer than most people expect, provided the margin stays clean and grinding is kept under control. If yours has been in for more than a decade, or it's started feeling different, it's worth having assessed before a small problem becomes a bigger one. We place and replace crowns regularly for families across Campbelltown, Camden and the wider Macarthur region, and you can read more about our dental crowns in Campbelltown. Call us on (02) 4628 2151 or book online.

Frequently Asked Questions

How often do crowns need to be replaced?

There's no set schedule. A crown is replaced when there's a reason to replace it: decay underneath, a fracture, a lost seal, or gum recession that's exposed the margin. Plenty of crowns run 20 years or more without needing anything done to them.

Can a dental crown be replaced with another crown?

Yes, in most cases. The old crown is sectioned and removed, the tooth is cleaned and rebuilt if needed, and a new crown is made. The limiting factor is how much healthy tooth remains, which is why replacing early is far easier than replacing late.

Is it normal for a crown to feel sensitive years after it was fitted?

Not really. The crown has no nerve of its own, so sensitivity usually means something is reaching the natural tooth underneath, whether that's a gap at the margin, decay, or exposed root from receding gums. New sensitivity in a crowned tooth is worth having checked.

What happens if you don't replace a failing crown?

Decay continues under the seal where a toothbrush can't reach it. Given enough time the tooth can lose so much structure that a new crown won't hold, and the remaining options narrow to root canal treatment or removal. A tooth that's simple to save in January can be considerably harder by December.

Will a dentist replace a crown for free if it fails?

That varies between practices and depends a great deal on why it failed and how long it had been in place. Some clinics have their own policy on early failures. There's no industry-wide rule, and no dentist can promise a crown will last a set number of years, so it's better to ask about it directly at the time of treatment than to assume.