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[Retreatment of Root Canal Treatment] The tooth that had root canal treatment hurts and is loose (ft. Zeiss microscope)

Seoul Jeseng Dental Clinic · 신촌 치아지킴희 전준희 · March 5, 2025

Hello. I’m Jeon Jun-hee, the head dentist at Seoul Jasaeng Dental Clinic in Sinchon. As a specialist in conservative dentistry, I have performed countless root canal treatments and...

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This page is an English translation of a Korean Naver Blog archive entry. For exact wording and source context, verify against the Korean archive original and the original Naver post.

Clinic: Seoul Jeseng Dental Clinic

Original post date: March 5, 2025

Translated at: April 20, 2026 at 5:14 PM

Medical note: This translation does not guarantee medical accuracy or suitability for treatment decisions.

[Retreatment of Root Canal Treatment] The tooth that had root canal treatment hurts and is loose (ft. Zeiss microscope) image 1

Hello.

I’m Jeon Jun-hee, the head dentist at Seoul Jasaeng Dental Clinic in Sinchon.

As a specialist in conservative dentistry, I have performed countless root canal treatments and retreatments.

Most of the patients who come to me arrive with sudden tooth pain, gum inflammation, and loose teeth.

The case I’ll introduce this time is similar. In the upper left area, where root canal treatment had been done before, sudden pain and sudden looseness occurred in two teeth, one in each tooth.

The patient was a woman in her 30s, and to avoid extraction, I attempted retreatment using a microscope.

Thanks to the patient’s cooperation and positive attitude, treatment progressed smoothly, and we were able to save both teeth.

[Retreatment of Root Canal Treatment] The tooth that had root canal treatment hurts and is loose (ft. Zeiss microscope) image 2

20240411

She had undergone root canal treatment on multiple teeth. Most of the teeth that had received root canal treatment showed recurrent inflammation at the root tips.

Just because inflammation is visible on an X-ray does not mean all cases must be treated. (Of course, treatment is recommended if the size is excessively large or if it threatens adjacent anatomical structures.)

The most important thing is the patient’s discomfort. If there is discomfort, and further, pain, the attending dentist will consider treatment.

[Retreatment of Root Canal Treatment] The tooth that had root canal treatment hurts and is loose (ft. Zeiss microscope) image 3

20240411 This is the photo before treatment.

The previous root canal treatment looks a bit rough. That is because imaging technology, instruments, and materials were not as advanced as they are now. However, it still held up in the mouth for years without discomfort. It is not uncommon to see cases where it has been used for more than ten years.

Rather than how it looks on an X-ray, what matters is whether it is actually connected to the patient’s discomfort. That is how you can think about deciding whether retreatment is needed.

[Retreatment of Root Canal Treatment] The tooth that had root canal treatment hurts and is loose (ft. Zeiss microscope) image 4

20250120 After multiple visits, retreatment of the two teeth was completed.

The photo before treatment was taken in April, and the photo after treatment was taken in January of the following year. Because I proceeded one by one (the molar on the far right also underwent root canal treatment), it took a long time. In total, three teeth were treated in succession.

The leftmost tooth will also be followed up, and if symptoms occur, retreatment will be performed.

[Retreatment of Root Canal Treatment] The tooth that had root canal treatment hurts and is loose (ft. Zeiss microscope) image 5

20250225

The finishing touch to treatment is a strong crown. For highly visible areas, a zirconia crown is good. It is strong and beautiful. It looks even better in person than in photos.

[Retreatment of Root Canal Treatment] The tooth that had root canal treatment hurts and is loose (ft. Zeiss microscope) image 6

20250225 This is a group photo of the teeth taken after treatment.

There are several teeth that are being monitored because inflammation is visible on X-rays. I sincerely hope they do not cause any problems^^;

This time as well, I hope the treated teeth can be used for a long, long time.

#Retreatment of Root Canal Treatment

#Microscope

#Specialist in Conservative Dentistry

#Dentist Jeon Jun-hee, the tooth saver

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