Can You Get a Cavity Under a Dental Crown?

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26 Jun 2026 Time - 1:00 pm

If you have a dental crown, you may assume the tooth underneath is completely protected from cavities. But can you actually get a cavity under a dental crown?

The answer is yes. While a crown covers and protects much of a tooth, the area where the crown meets the natural tooth can still be vulnerable to plaque and decay.

How Can a Cavity Develop Under a Crown?

A dental crown covers the visible portion of a damaged tooth, but it does not replace the entire tooth.

If bacteria and plaque build up around the edge of the crown, decay can potentially develop in the remaining natural tooth structure.

Poor oral hygiene, gum problems, and an aging or damaged crown can increase the risk.

What Are the Signs of Decay Under a Crown?

A cavity under a crown isn't always easy to identify yourself. However, you may notice:

• Tooth sensitivity
• Pain around the crowned tooth
• Pain when biting
• Bad taste or smell
• Swollen or irritated gums
• A crown that feels loose
• Food getting trapped around the crown

Sometimes there may be no noticeable symptoms at all, which is one reason regular dental examinations are important.

Can a Crown Get a Cavity?

The crown itself cannot develop a cavity because it is made from dental material rather than natural tooth enamel.

However, the natural tooth underneath or around the crown can develop decay.

This is why brushing, cleaning between your teeth, and attending regular dental appointments remain important even after receiving a crown.

What Happens If There Is Decay Under a Crown?

The treatment depends on how extensive the decay is and how much healthy tooth structure remains.

Your dentist may need to examine the crown and tooth, and dental X-rays may be recommended to evaluate areas that cannot be seen directly.

In some cases, the crown may need to be repaired or replaced. If the tooth has significant damage, additional treatment may be necessary.

How Can You Protect a Tooth With a Crown?

You can help protect your crowned tooth by:

• Brushing twice a day
• Cleaning between your teeth every day
• Limiting frequent sugary foods and drinks
• Avoiding using your teeth to bite hard objects
• Attending regular dental checkups

A crown is not a replacement for good oral hygiene.

Dental Crowns

If you have a dental crown that feels different, is causing discomfort, or has become loose, don't wait for the problem to get worse.

Call Iris Dental Group or book your appointment online. Our dental team can examine your crown and the tooth underneath and recommend the appropriate next step.

Have a concern about your dental crown? Contact Iris Dental Group today to schedule an appointment and keep your smile on track.