Root Canal Treatment: Addressing Odor Issues After Crown Placement - Dentistry

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Root canal treatment


Hello, doctor.
I would like to ask about a molar that underwent root canal treatment and was capped three months ago.
Recently, after brushing my teeth, I noticed that the tooth has an unpleasant odor when I touch it with my hand.
No matter how much I brush, it still smells.
I'm a bit worried about whether the crown is properly sealed, but I don't feel any discomfort in that tooth.
Is it common for crowns to have an odor? How can I check the condition of my tooth? It seems impossible to just open it up for inspection.
Is there a convenient way to see if it is securely bonded? Thank you!

Mei Mei, 20~29 year old female. Ask Date: 2013/04/29

Dr. Zeng Guanghui reply Dentistry


Hello: After undergoing root canal treatment on a molar and having a crown placed, there will be a junction between the crown and the tooth.
Although the fit is excellent, if not cleaned thoroughly, food debris can accumulate in that junction over time.
Bacteria in the mouth can ferment these food particles, leading to the production of acidic substances and unpleasant odors.
Therefore, it is recommended to maintain good oral hygiene and develop a habit of having dental cleanings every six months to remove tartar.
To check if the crown is secure, you can bite down on something to see if it moves.
If you are uncertain, please consult your dentist for a further examination.
Wishing you good health.

Reply Date: 2013/04/29

More Info


When it comes to root canal treatment and the subsequent placement of a crown, it is not uncommon for patients to experience concerns about odor emanating from the treated tooth. In your case, having undergone root canal therapy and subsequently had a crown placed on your molar, the presence of an unpleasant smell can be alarming, especially since you have not experienced any discomfort associated with the tooth.

Firstly, it is essential to understand that the root canal procedure involves the removal of the tooth's pulp, which can sometimes lead to residual bacteria being trapped within the tooth structure or the surrounding tissues. If the tooth was not entirely disinfected during the root canal treatment, or if there is a failure in the sealing of the canal, bacteria can proliferate, leading to odor. This situation can also occur if there is decay or infection in the surrounding tooth structure that was not addressed during the treatment.

The crown itself, if not properly fitted or if there are gaps between the crown and the tooth, can also harbor bacteria and food particles, leading to an unpleasant smell. It is crucial to ensure that the crown is well-sealed to prevent any leakage that could allow bacteria to enter.
To assess the situation, here are some steps you can take:
1. Oral Hygiene: Maintain excellent oral hygiene practices. Ensure that you are brushing your teeth at least twice a day and flossing daily. Pay special attention to the area around the crown to remove any food particles or plaque that may contribute to the odor.

2. Professional Cleaning: Schedule an appointment with your dentist for a thorough cleaning. A dental professional can remove any plaque or tartar buildup that may be contributing to the odor and can also check the integrity of the crown and the surrounding gum tissue.

3. Visual Inspection: While it may not be feasible for you to open the crown yourself, your dentist can perform a visual inspection and possibly take X-rays to check for any underlying issues, such as infection or decay that may not be visible to the naked eye.

4. Odor Source Identification: If the smell persists after maintaining good oral hygiene and having a professional cleaning, your dentist may need to investigate further. This could involve removing the crown to check for any issues with the underlying tooth structure or the root canal filling.

5. Follow-Up Care: If there is any indication of infection or decay, your dentist will recommend appropriate treatment, which may include retreating the root canal or addressing any decay present.

In summary, while the presence of odor from a crowned tooth after root canal treatment can be concerning, it is often manageable with proper care and professional intervention. It is essential to communicate your concerns with your dentist, who can provide a thorough examination and determine the best course of action to resolve the issue. Regular dental check-ups are crucial to maintaining oral health and addressing any potential problems early on.

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