Sudden Pain in Root-Canaled Tooth When Chewing: Causes and Solutions - Dentistry

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Teeth that have undergone root canal treatment may suddenly experience pain when biting down or applying pressure?


Dear Doctor,
For the past few days, I have been experiencing pain in my second-to-last lower molar when I apply pressure from above during biting.
However, if I don't touch it, the pain is minimal.
I have been waking up at night due to the pain (I'm not sure if it's from clenching my teeth while sleeping or just spontaneous pain).
The pain also occurs when I lie down, but it significantly alleviates when I stand or sit up.
Pressing on the gums from the inside or outside does not cause pain; it only hurts when I apply pressure directly from above the tooth.
This tooth underwent root canal treatment about 4-5 years ago and has been capped with a crown.
Recently, I have been staying up late and experiencing sleep deprivation.
I would like to know what might be causing the issue with my tooth.
Thank you.

Zhuang Xiansheng, 20~29 year old female. Ask Date: 2020/01/20

Dr. Lin Jiayong reply Dentistry


Hello: The pain has affected your daily activities, and based on your description, this pain is likely related to changes in posture and stress.
It is highly possible that there is an issue with the internal root canal again.
I recommend that you promptly visit a medical facility for a detailed examination and treatment.
Thank you!

Reply Date: 2020/01/20

More Info


Sudden pain in a root-canaled tooth, especially when chewing or applying pressure, can be concerning and may indicate several underlying issues. Given your description, it seems that the pain is localized to the right lower second molar, which has previously undergone root canal treatment and is covered with a crown. Here are some potential causes and solutions for your situation:

Possible Causes
1. Residual Infection: Even after a root canal, there can be residual bacteria that lead to reinfection. This can cause inflammation in the surrounding tissues, leading to pain when pressure is applied.

2. Crown Issues: If the crown is not fitting properly or has become loose, it can cause discomfort when biting down. A misaligned crown can also lead to uneven pressure on the tooth.

3. Fractured Tooth: Sometimes, a tooth that has undergone root canal treatment can develop cracks or fractures, which may not be visible but can cause significant pain when pressure is applied.

4. Gum Issues: Although you mentioned that pressing on the gums does not cause pain, it’s still possible that there is some inflammation or infection in the gum tissue surrounding the tooth that could be contributing to your discomfort.

5. Bruxism: If you have been experiencing increased stress or changes in your sleep patterns (like staying up late), you might be grinding your teeth (bruxism) at night. This can lead to tooth pain and sensitivity, especially in teeth that have had previous dental work.

6. Sinus Issues: Sometimes, sinus infections can cause referred pain to the upper teeth, but since your pain is in the lower jaw, this is less likely unless there is a specific anatomical connection.


Solutions
1. Dental Evaluation: The first step is to schedule an appointment with your dentist. They can perform a thorough examination, including X-rays, to check for any signs of infection, crown issues, or fractures.

2. Endodontic Consultation: If there is a suspicion of reinfection or complications related to the root canal, your dentist may refer you to an endodontist (a specialist in root canal treatments) for further evaluation and possible retreatment.

3. Crown Adjustment: If the crown is found to be the issue, your dentist can adjust or replace it to ensure proper fit and alignment, which may alleviate the pain.

4. Pain Management: In the meantime, over-the-counter pain relievers such as ibuprofen or acetaminophen can help manage discomfort. However, this should not replace professional evaluation.

5. Stress Management: If bruxism is suspected, consider stress management techniques or a night guard to protect your teeth while you sleep.

6. Follow-Up Care: After any treatment, ensure you follow up with your dentist to monitor the situation and prevent further complications.


Conclusion
Pain in a root-canaled tooth can arise from various issues, and it is essential to address it promptly to prevent further complications. Since you have a history of root canal treatment, it is crucial to consult with your dentist as soon as possible to determine the exact cause of your pain and to receive appropriate treatment. Ignoring the symptoms may lead to more severe problems, including the potential loss of the tooth. Remember, timely intervention is key to maintaining dental health.

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