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Causes of Gaps in Porcelain Dental Crowns and How to Fix Them

Huynh Quoc Khanh
Huynh Quoc Khanh
Asked: 19/09/2026

Hello doctor, I have a friend who got porcelain crowns several years ago, but recently noticed that there is a gap at the gumline around the porcelain crown, which looks quite unattractive and sometimes causes food to become trapped. This makes me somewhat worried because I am also planning to get porcelain crowns in the near future. Could you please tell me why gaps can occur after getting porcelain crowns and whether there are any ways to fix or prevent this condition?

Hello, after porcelain dental restoration, some people may experience gaps in porcelain dental crowns, causing discomfort while eating or affecting the aesthetics of the smile. Recognizing the signs early and understanding the causes will help you take timely measures to protect your oral health.

Signs of Gaps in Porcelain Dental Crowns

The condition of gaps in porcelain dental crowns can usually be recognized through the following signs:

  • The appearance of a gap between the porcelain crown and the gums
  • Food easily becoming trapped around the porcelain crown
  • A sensation of tooth sensitivity or discomfort when consuming hot or cold foods
  • Bad breath caused by bacteria accumulating in the gap
  • The gum area around the porcelain crown showing signs of redness or swelling

If you experience these signs, you should visit a dental clinic for an early examination to avoid more serious oral health problems.

Causes of Gaps in Porcelain Dental Crowns

There are many causes of gaps in porcelain dental crowns, ranging from restoration technique to oral care practices.

Insufficient Dentist Expertise

If the dentist does not perform the procedure correctly or prepares the natural tooth inaccurately, the porcelain crown may not fit closely around the prepared tooth. This can easily lead to a gap after the crown is placed.

Incorrectly Sized Porcelain Crown

The porcelain crown needs to be designed accurately according to the size of the natural tooth. If there are inaccuracies during the fabrication process, the porcelain crown may not fit properly against the natural tooth and may result in gaps in porcelain dental crowns.

Gum Recession After Porcelain Crown Placement

After a period of use, some people may experience gum recession or loss of gum tissue, causing the cervical portion of the porcelain crown to become exposed and creating a gap.

Improper Oral Care

Poor oral hygiene or an inappropriate diet can also affect the durability of porcelain crowns and lead to problems such as gingivitis or gaps around the teeth.

Are Gaps in Porcelain Dental Crowns Dangerous?

If the condition of gaps in porcelain dental crowns persists, it can cause several oral health problems.

The gap between the porcelain crown and the gums creates favorable conditions for bacteria and food to accumulate, which can easily lead to bad breath, gingivitis, or decay of the underlying natural tooth.

In addition, this condition can also affect the aesthetics of the smile and cause many people to lose confidence when communicating.

Therefore, when you notice a gap in a porcelain crown, you should have it examined early to determine an appropriate treatment approach.

How to Fix Gaps in Porcelain Dental Crowns

Depending on the cause of gaps in porcelain dental crowns, the dentist may apply different corrective methods.

In many cases, the dentist will remove the old porcelain crown and fabricate a new crown to ensure a proper fit against the natural tooth.

If the cause is an oral condition such as gingivitis, the dentist may need to treat the gums before restoring the porcelain crown.

In addition, proper oral hygiene and regular dental check-ups can also help reduce the risk of experiencing this condition.

If you are experiencing gaps in porcelain dental crowns or want to have your porcelain crowns re-examined after dental restoration, you can visit Gangwhoo Cosmetic Hospital for a detailed examination and consultation with a dentist. With a team of specialized dentists and a modern dental technology system, the hospital will help accurately assess the condition of your porcelain crowns and provide an appropriate corrective solution to help protect your long-term oral health.


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