What Happens When You Get a Cavity Under a Dental Crown?
Posted on 7/15/2025 by Dr. Frank K. Sioda
A dental crown is a tooth-shaped restoration that covers a damaged or weakened tooth. It's like a strong cap that protects the tooth and restores its function and appearance.
While crowns are incredibly durable, they can't prevent cavities completely. Just like your natural teeth, a cavity can still form under a crown if proper oral care isn't maintained.
How Does a Cavity Develop Under a Crown?
There are two main ways a cavity can develop under a crown:
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Marginal leakage: This is when the seal between the crown and the tooth isn't perfect, allowing bacteria and food debris to seep under the crown and cause decay.
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Recurrent decay: This is when a new cavity forms next to the existing crown due to inadequate oral hygiene.
Signs and Symptoms of a Cavity Under a Crown
Recognizing the signs of a cavity under a crown is crucial for early intervention. Here are some common symptoms:
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Sensitivity to hot or cold: This is often the first sign of a cavity, as the bacteria irritate the tooth's inner pulp.
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Pain when biting or chewing: As the cavity progresses, it can cause pain when biting down on food.
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Discoloration of the crown: You may notice a white or brown spot on the crown, indicating the presence of decay.
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Swelling or tenderness in the gums: This can be a sign of an infection caused by the cavity.
What to Do if You Suspect a Cavity Under a Crown
If you experience any of these symptoms, it's important to visit your dentist immediately. They will examine your tooth and perform an X-ray to confirm the presence of a cavity.
Depending on the severity of the decay, your dentist may recommend the following treatment options:
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Removal and replacement of the crown: This is often necessary if the decay is extensive or has reached the tooth's pulp.
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Restoration of the crown: If the decay is small and hasn't reached the pulp, your dentist may be able to remove the decayed portion of the tooth and rebuild the crown.
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Root canal therapy: In some cases, the decay may have reached the pulp, necessitating root canal therapy to save the tooth.
Preventing Cavities Under Crowns
The best way to prevent cavities under crowns is to maintain excellent oral hygiene:
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Brush your teeth twice daily with a fluoride toothpaste: Be sure to brush gently around the crown margin.
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Floss daily: Flossing helps remove plaque and food particles that can accumulate under the crown.
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Use an antiseptic mouthwash: This can help kill bacteria that contribute to decay.
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Visit your dentist regularly for checkups and cleanings: Your dentist can monitor the condition of your crowns and detect any early signs of decay.
Conclusion
While a dental crown is a long-lasting restoration, it's still important to take good care of it and maintain proper oral hygiene. By following these tips, you can prevent cavities and keep your crowned tooth healthy for years to come.
Remember, if you suspect a cavity under a crown, don't hesitate to contact your dentist for an evaluation. Early detection and treatment are key to preserving your dental health.
Talk to one of our caring patient coordinators today to schedule an appointment.
Dr. Frank Sioda 18676 Willamette Dr. Suite 202 West Linn, OR 97068-1718
Dental Blog | Dentist West Linn | ZenTech Dentistry Dr. Frank Sioda of ZenTech Dentistry has created this informative blog to help educate the community about a variety of dental topics. Learn more here. ZenTech Dentistry - Frank K. Sioda, DMD, PC, 18676 Willamette Dr., Suite 202, West Linn, OR 97068-1718 • (503) 765-9699 • zentechdentistry.com • 12/12/2025 • Related Terms: dentist West Linn •
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A dental crown is a tooth-shaped restoration that covers a damaged or weakened tooth. It's like a strong cap that protects the tooth and restores its function and appearance.