Can You Get a Cavity Under a Dental Crown?

Dental crowns are a common solution for protecting and restoring damaged or weakened teeth. While a crown acts as a protective cap, it’s still possible for a tooth to develop a cavity beneath it. At Feather Touch Dental Care in Atlanta, GA, we often get asked about the likelihood and prevention of cavities under crowns. Understanding how decay can occur and what to do about it can help you maintain your oral health and keep your smile strong.

How Can a Cavity Form Under a Dental Crown?

A dental crown itself cannot decay, as it is typically made from materials like porcelain, metal, or ceramic. However, the natural tooth underneath the crown is still susceptible to bacteria and decay, particularly at the margin where the crown meets the tooth. Over time, if proper oral hygiene isn’t maintained, plaque and bacteria can accumulate around the base of the crown, potentially leading to decay.

The most common reasons for decay under a crown include:

• Improper Fit or Aging Crown: As dental crowns age, they may lose their perfect fit. Gaps can form between the crown and the gum line, creating a space where bacteria can collect and cause decay.
• Poor Oral Hygiene: Failing to brush and floss properly around the crown allows plaque and tartar to build up, increasing the risk of cavities forming beneath the crown.
• Damage to the Crown: If the crown is cracked or chipped, it can expose the underlying tooth to harmful bacteria, which may eventually lead to decay.

What Happens If a Tooth Decays Under a Dental Crown?

If decay occurs beneath a crown, it can lead to several issues that may compromise both the tooth and the crown. Signs that something is wrong can include pain or sensitivity, swelling of the gums, or even a noticeable odor. Once decay sets in, the tooth underneath becomes weak, which can cause the crown to loosen or fall off. Here’s what to expect if decay is found under a crown:

• Diagnosis: The dentist may use X-rays to check for decay that isn’t visible to the naked eye. Decay under a crown can be difficult to detect in its early stages, so regular dental checkups are crucial.
• Treatment Options: If the decay is mild, it may be possible to remove the crown, treat the cavity, and re-cement or replace the crown. However, if the decay is extensive and reaches the pulp of the tooth, a root canal might be required before a new crown can be placed. In extreme cases, if the decay is too severe, the tooth may need to be extracted.
• Replacing the Crown: If the crown has been compromised, a new one will need to be crafted to fit securely over the repaired tooth.

According to the American Dental Association, dental crowns typically last between 5 to 15 years, but this lifespan can be shortened if proper care isn’t taken. Research shows that about 50% of adults aged 30 and older have experienced some form of periodontal disease, which can increase the risk of decay around crowns if not managed properly. A study by the National Institutes of Health found that recurrent decay is one of the most common reasons for crown replacement.

How to Prevent Decay Under a Crown

Prevention is key to avoiding cavities under dental crowns. Here are a few tips to keep your crowned teeth healthy:

• Maintain Good Oral Hygiene: Brush your teeth at least twice a day and floss regularly, paying special attention to the area around the base of the crown where plaque can build up.
• Use Fluoride Toothpaste: Fluoride helps strengthen tooth enamel, including the portion of the natural tooth still exposed under a crown.
• Regular Dental Checkups: Regular visits to your dentist allow them to monitor the condition of your crown and detect any potential issues before they become serious.
• Avoid Hard Foods: Hard foods can damage or crack a crown, exposing the underlying tooth to decay. Be cautious when eating foods like nuts, ice, or hard candy.

At Feather Touch Dental Care in Atlanta, GA, our goal is to help you maintain your crowns and overall oral health for as long as possible. If you’re experiencing any discomfort or suspect an issue with your dental crown, don’t hesitate to contact us. We offer expert care to ensure your dental health remains in top condition.