Can a Tooth Go Bad Under a Crown? Signs, Causes, and What to Do!
By: When a dental crown is placed over a damaged or weakened tooth, it acts as a protective helmet. It both restores your tooth’s strength and enhances its appearance. If you think of it, it seems that the tooth underneath is completely safe from harm.
But is it? Not quite.
Many people assume that once they get a dental crown, they’re in the clear. But the truth is that a tooth can still go bad under a crown. Decay, infection, and even cracks can develop without your noticing.
Wait until the symptoms start to show! Of course, you don’t want that to happen.
So we’re breaking down how and why a tooth can go bad under a crown, the warning signs you should look out for, and what you can do to fix or prevent it.
Let’s address the most important question.
Can a Tooth Decay Under a Crown?
Yes! A crowned tooth is not decay-proofed. While the crown covers most of the tooth, the edge where the crown meets the natural tooth is basically exposed. Life a thief in the night, bacteria can sneak into this area, harboring decay underneath, often without obvious symptoms in the early stages.
Worse, if the crown is old, poorly fitted, or has developed small cracks, bacteria can push itself in, causing decay and even infection in the underlying tooth.
Signs That Your Tooth Might Be Going Bad Under a Crown
Bad crowns can go unnoticeable, but there are telltale signs that can help you address this dental problem immediately:
1. Your Tooth Looks Black Under the Crown
Watch out for a dark or blackish tint near the gum line of your crown. That could be decay or internal staining. Sometimes, old crowns with metal bases can also cause discoloration, but if you see blackness spreading—it’s time to see your dentist.
2. Pain or Sensitivity in the Crowned Tooth
Having a crown should feel natural. If you experience discomfort like sharp pain when chewing or sensitivity to hot or cold, it might be a sign that:
- The tooth under the crown has developed decay.
- There’s a crack in the crown, exposing the tooth.
- A root canal-treated tooth is failing due to hidden infection.
3. A Bad Smell or Foul Taste Coming from Your Crown
According to the American Dental Association, half of all adults have experienced bad breath or halitosis at some point in their lives. In most cases, bad breath results from bacteria which can also live inside your crown.
If you consistently notice a bad smell or taste coming from a crowned tooth, it might mean that bacteria and food particles are trapped underneath. This could even indicate decay or even infection.
4. Swollen, Bleeding, or Receding Gums Around the Crown
Crowns are designed to fit snugly around the gums. If the gum area around the crown appears swollen, bleeds when you brush, or seems to be receding, there could be an underlying issue like:
- A leaking crown allowing bacteria in.
- Gum disease affecting the crown tooth.
- An infection beneath the crown.
5. Your Crown Feels Loose or Wobbly
A properly placed crown should feel secure. If it feels loose or shifts when you chew, it might be because:
- Decay under the crown has weakened the bond.
- The crown wasn’t fitted properly or the cement has worn away.
Why Does a Tooth Go Bad Under a Crown?
Now that you know what to look for, let’s talk about why a crowned tooth can still develop problems.
1. Decay Forming Beneath the Crown
Bacteria can slip into the tiny space where the crown meets the tooth. If plaque isn’t removed properly, cavities can form under the crown, making them difficult to detect.
How common is decay under a crown? Fairly common, especially due to poor oral hygiene or an aging crown.
2. Cracked Tooth Under the Crown
While a crown strengthens a tooth, it doesn’t make it indestructible. If the tooth under the crown cracks—whether from biting something hard or grinding your teeth—bacteria can enter and cause decay or infection.
Decay can hide beneath the crown, making it tricky to detect until symptoms appear. Even through imaging or an X-ray, decay can still be undetectable.
3. Root Canal Failure
If the crowned tooth had a root canal, it can still develop infection if bacteria were left behind. Over time, this can lead to swelling, pain, and even abscesses. Tooth can be dead under a crown even after a root canal, and can develop new infections.
4. Poorly Fitted or Old Crowns
An ill-fitting crown leaves gaps for bacteria to sneak in. Over time, crowns can also wear down or loosen, increasing the risk of decay underneath.
What Happens If Decay Under a Crown Is Left Untreated?
Ignoring decay under a crown can lead to:
- Severe tooth infection – Decay can spread to the root and jawbone.
- Tooth loss – If the decay is too advanced, the tooth may need to be extracted.
- Painful abscesses – A pocket of pus can form, leading to swelling, pain, and even fever.
Can Decay Under a Crown Be Fixed?
Here’s the good news! If caught early, decay under a crown can be treated! Here’s what your dentist in Culver City might do:
1. Removing and Replacing the Crown
If decay is minor, the crown can be removed, the decay cleaned out, and a new crown placed.
2. Treating the Cavity
If there’s only a small cavity, the dentist may be able to fill it without replacing the entire crown.
3. Root Canal Treatment
If decay has reached the tooth’s nerve, a root canal might be needed before a new crown is placed.
4. Tooth Extraction (Worst-Case Scenario)
If the decay is too deep, tooth extraction might be needed to place a dental implant or bridge.
How to Prevent Tooth Decay Under a Crown
The best way to avoid decay under a crown is to take care of it properly. And strategies aren’t something you find in a medical journal. Nonetheless, these are common, yet effective crown-care tips:
- Floss daily – Yes, even around the crown!
- Brush at least twice a day – Use fluoride toothpaste to strengthen enamel.
- Use an antibacterial mouthwash – Reduces plaque buildup.
- Get regular dental checkups – Catch issues early!
- Avoid hard or sticky foods – These can loosen or crack your crown.
Final Thoughts: Don’t Ignore the Signs!
As a final note, remember that a dental crown is a protective helmet and not a suit of armor. Its protection against infection or decay might be enhanced but not 100% guaranteed.
If you notice pain, discoloration, or bad breath coming from your crown, don’t wait—get it checked with us at United Dental Care in Culver City.
Catching decay early can save your tooth, prevent costly procedures, and keep your smile healthy for years to come!
So, if your crowned tooth is acting suspicious, don’t just brush it off—book a free consultation with us!
