Persistent Pain After Microscopic Root Canal Treatment - Dentistry

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Microscopic Root Canal Treatment


Hello Doctor: I completed root canal treatment at the end of November last year, but I have been experiencing persistent dull pain, pain when tapping, and pain when biting down on food.
Therefore, I switched to another clinic for microscopic root canal treatment in January this year.
The doctor has placed medication about four times, and the nerve has been thoroughly cleaned.
Although the dull pain has improved somewhat, I still experience pain when tapping and am hesitant to bite down on anything because it hurts.
The doctor examined with a microscope and said there are no cracks, and the cavity from my initial decay was not large.
She is also unsure why the pain has lasted this long, only suggesting that if there is gradual improvement, we should continue with the medication and monitor the situation.
I would like to ask if this situation is normal...? After all, if the nerve is clean, why am I still unable to bite down? The doctor suspects it may be due to periodontal ligament damage, but can it take this long to heal? Additionally, since November last year until now in February, I have been using the other side of my mouth to chew, and I have a tooth on that side that was already sensitive.
Prolonged use of that side has led to increased wear, and the sensitivity of that tooth has worsened.
How can I address this issue? Thank you, Doctor.

Yu, 20~29 year old female. Ask Date: 2023/02/23

Dr. Lin Jiayong reply Dentistry


Hello: Since the root canal treatment was completed in January, it is recommended to observe for at least three months before deciding on any more aggressive treatments (such as apicoectomy, flap regeneration, or extraction followed by dental implants).
It may also be beneficial to take a cone beam computed tomography (CBCT) scan of that side to assess the surrounding conditions, or to consult a neurologist to determine if it is a trigeminal nerve issue.
It is advisable to chew on both sides and to consume softer, more liquid foods.
For sensitive teeth, using desensitizing toothpaste regularly can help improve the condition.

Reply Date: 2023/02/23

More Info


Persistent pain following microscopic root canal treatment can be a frustrating and concerning experience for patients. Your situation, where you have undergone root canal treatment and are still experiencing discomfort, is not uncommon. There are several factors that could contribute to this ongoing pain, and understanding them can help you manage your expectations and treatment moving forward.

Firstly, it’s important to recognize that after a root canal treatment, the tooth and surrounding tissues may still be healing. The process of cleaning out the infected pulp and sealing the tooth can cause inflammation in the surrounding tissues, which may lead to discomfort or pain. This is especially true if there was significant infection or inflammation prior to the treatment. The body’s healing response can sometimes take weeks or even months, and during this time, it is not unusual to experience varying levels of discomfort.

In your case, since you mentioned that the pain has improved somewhat but still persists, it could indicate that the healing process is ongoing. The fact that your dentist has not found any cracks or other issues with the tooth is a positive sign, but it does not completely rule out other potential causes of pain. One possibility is that the periodontal ligament, which surrounds the tooth root, may have been affected during the treatment. Damage or inflammation in this area can lead to pain when biting or applying pressure to the tooth.

Another factor to consider is the possibility of residual infection or inflammation. Even after thorough cleaning, some bacteria may remain, or there may be a reaction to the materials used during the treatment. The repeated application of medication suggests that your dentist is taking steps to manage any potential infection or inflammation, which is a standard practice in such cases.

Regarding your concern about the sensitivity in your other teeth due to compensatory chewing, this is a common issue. When one side of the mouth is favored for chewing, it can lead to increased wear and sensitivity in those teeth. It’s essential to address this imbalance to prevent further dental issues. You might consider discussing with your dentist the possibility of a bite adjustment or exploring other options such as a night guard to help distribute the chewing forces more evenly.

In terms of managing your pain, it’s crucial to follow your dentist’s recommendations. If the pain becomes unbearable or if you notice any new symptoms, such as swelling or fever, you should seek immediate care. Additionally, over-the-counter pain relievers can be helpful, but it’s important to use them as directed and consult your dentist if you feel they are not providing adequate relief.

In summary, while persistent pain after root canal treatment can be concerning, it is not uncommon. Healing takes time, and various factors can contribute to ongoing discomfort. Regular follow-ups with your dentist are essential to monitor your progress and make any necessary adjustments to your treatment plan. If your symptoms do not improve or worsen, further diagnostic imaging or referral to a specialist may be warranted to explore other underlying issues. Your oral health is important, and addressing these concerns promptly can help ensure a better outcome.

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