Root Canal Failure

When a previously root canal treated tooth becomes re-infected, it is called root canal failure. The common causes of root canal failure are improper cleaning of the root canal, undetected root canal, inaccessible root canal, and root fracture. The treatment options of a re-infected tooth are doing a root canal again, apicoectomy, or extraction.

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i have swelling in the gums with pus near to the teeth which is root canal treated. What to do?

Query: Hello doctor,My dentist performed a root canal treatment on one of my upper molar teeth. He assured that it was a minor infection as he checked the X-ray, but he could not handle that tooth infection later on. A point-size hard stumble appeared on the gums near the tooth where the root canal was don...  Read Full »


Dr. Bhargav Gutha

Answer: Hello, Welcome to icliniq.com. Upon review, these were the findings, Swelling in the upper right vestibule in relation to the right first molar. Restoration in relation to the right first molar. The red color swelling in the gums is probably an abscess due to caries in relation to the right first ...  Read Full »

Is re-RCT necessary for treating pain in an RCT-treated tooth?

Query: Hello doctor,I am a 36 year old male. I had a root canal treatment five years back. Since the last two days, I have severe pain in the same tooth. Irrespective of a cold or hot sensation, the pain was constant. My dentist has prescribed Oflox OZ and Meftal forte for five days and advised re-RCT. Pl...  Read Full »


Dr. Naveen Thomas

Answer: Hello, Welcome to icliniq.com. I have seen the X-ray (attachment removed to protect patient identity). There is an infection in one of the roots of the tooth, which needs a retreatment. You can see it as a black circle surrounding the apex of the posterior root. There is no option but to undergo re...  Read Full »

Are there any alternate options to root canal treatment?

Query: Hello doctor, My husband has been told he needs a root canal on two of his teeth. He has had seven root canals in his life and then crowns on those teeth. He is 49 and has now lost all of the teeth that he had root canals and crowns on. He has problems with the crowns. They tell him he has a small ...  Read Full »


Dr. Honey Nandwani

Answer: Hello, Welcome to icliniq.com. If his teeth need a root canal treatment, the best way to save them will be to get the teeth capped. Root canal treated teeth become fragile and needs to be capped without fail. For a proper treatment, after getting a root canal treatment done, I suggest you consult a...  Read Full »

Why did the infection spread to the jaw even after root canal treatment?

Query: Hi doctor, I had a root canal by a general dentist. I was told that the tooth was infected and going through with the procedure would be my best. I consented and had my treatment. I was done with the treatment and came home with full of instructions given to me. I had Penicillin and Ibuprofen for ev...  Read Full »


Dr. Tinu Thampy

Answer: Hello, Welcome to icliniq.com. As per the radiograph (attachment removed to protect patient identity), your tooth infection had extended beyond the root apex and entered the underlying bone, and it becomes a periapical abscess. The tooth roots are much flared also. Root canal treatment is a conserva...  Read Full »

Is it normal to have pain after root canal treatment?

Query: Hello doctor, I have pain two weeks after root canal treatment.  Read Full »


Dr. Mousam Chattopadhyay

Answer: Hello, Welcome to icliniq.com. I went through your query and the attached x-ray (attachment removed to protect patient identity). Kindly let me know how long you have been facing pain post root canal. Was it continuous after the procedure did, or it started recently? The x-ray does not s...  Read Full »

Why do I have pain in the tooth even after RCT?

Query: Hi doctor, Three weeks ago, I had a root canal done. But, the pain is still present. I cannot bite anything as the pressure gives pain. Kindly help.  Read Full »


Dr. Naveen Thomas

Answer: Hello, Welcome to icliniq.com. If even after three weeks of root canal treatment and the pain is not relieved, then you should show to the dentist as there may be some infection is remaining. Your dentist should take an x-ray again to check for infection and either repeat the procedure or give you m...  Read Full »

Can a tooth abscess cause light-headedness, dizziness, and a blocked ear?

Query: Hello doctor, I have a failed root canal with an abscess. I have been feeling light-headed, dizzy with a blocked ear. I had MRI and blood tests to rule out other issues, and they are clear. Can the abscess cause these issues? If so, how long for lightheadedness to go once the tooth is removed?  Read Full »


Dr. Ummah Mohammad

Answer: Hello, Welcome to icliniq.com. I would suggest you get the affected tooth extracted as soon as possible because it is not merely extraction, your dentist will first subside the collected abscess, and as soon as the treatment gets started, you will begin feeling better. Your question about if other...  Read Full »

Can unremoved files during RCT procedure cause severe tooth pain?

Query: Hello doctor, I had an RCT done on the lower molar (number 6) two months ago. The file was left inside the canal, which I did not know. It was a mild sensation for a month or so. Then I went for fixing the crown. The dentist asked to cut the gums because enough space was not there for fixing the cr...  Read Full »


Dr. Naveen Thomas

Answer: Hello, Welcome to icliniq.com. It may cause pain if the file is protruding out of the canal, but is not usually the cause. There may be a hidden canal infection. Usually, such pain is caused when more disinfectant liquid is injected into the bone beyond the canal. It should clear up when the l...  Read Full »

Why am I getting radiating pain on the root canal treated left upper tooth?

Query: Hi doctor, I am having severe pain on my left side jaw and cheek, frequently for about two years. It seems it radiates from the last tooth of upper jaw and lower jaw. Both are root canal treated and crowned. The pain radiates from those two to the left jaw, cheek, and inner ear. I have seen many de...  Read Full »


Dr. Naveen Thomas

Answer: Hello, Welcome to icliniq.com. You may have an abscess related to root canal treated teeth. As the pain is only on the left side of face, and near to those teeth, there might be a relation. Please attach your OPG (orthopantomogram), x-ray, and pictures of your jaw inside the mouth area where you h...  Read Full »

How to restore my tooth?

Query: Hi doctor, I have neglected my dental health for a long time. I am a 62 year old married male. I have had several teeth extracted. I lived with a couple teeth whose caps have broken off on my left side and a few molars on the right for chewing. I am suffering from hypertension and is controlled wit...  Read Full »


Dr. Naveen Thomas

Answer: Hi, Welcome to icliniq.com. By reading about your symptoms, it seems that your root canal treated tooth is the one causing the problem. The rate of success of such root canal treatment is lesser in old age and also if you are diabetic. The only meaningful solution seems to remove the teeth and place...  Read Full »

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