Common "Root Canal Failure" queries answered by top doctors | iCliniq

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.

Recently Answered Questions Recently Answered Questions

All the answers published in this website are written by verified medical doctors, therapists and health experts. The Content has been moderated by iCliniq medical review team before publication. Post your medical clarifications on iCliniq by choosing the right specialty and get them answered. Your medical queries will be answered 24/7 by top doctors from iCliniq.

What are the signs of an infection in a root canal-treated tooth?

Query: Hello doctor, I had a fractured front tooth 20 years ago, which was treated by a dentist with a root canal procedure, adding a post, and placing a crown on the tooth. Today, I underwent a cone beam dental scan, which indicates a possible infection in the root canal-treated tooth. Is there indeed a...  Read Full »


Dr. Achanta Krishna Swaroop

Answer: Hello, Welcome to icliniq.com. I can understand your concern. I am the oral surgeon providing expert opinion on your case. As previously explained, there is indeed a moderate severity of infection present. Given that the tooth is not loose or mobile, a repeat root canal procedure would like...  Read Full »

A 5 mm file was left behind during RCT treatment. Is it fine?

Query: Hi doctor, Yesterday, I underwent a root canal treatment and almost five mm file was left behind. Will it cause any problem?  Read Full »


Dr. Divya Banu M

Answer: Hi, Welcome to icliniq.com. How are you doing? The file is completely sealing the root canal till the working length (the exact length of the canal till which the root canal is done). So, it is not a problem. I hope the doctor had cleaned and shaped the canal, and the file was sterile before the ...  Read Full »

My husband's root canal treated tooth without a cap got fractured. It is painful, so please suggest management for this pain.

Query: Hello doctor, My husband underwent a root canal treatment three and a half years ago. The dentist provided a point-of-service that falls under a health insurance plan and gave him a temporary filling without a cap. The doctor did not inform him about the need for a cap over the treated tooth. My hus...  Read Full »


Dr. Honey Nandwani

Answer: Hi, We appreciate you contacting us with your medical concerns. I am here to assist and direct you in better comprehending them. Based on the information that you provided, it seems that the root canal-treated tooth has reinfection leading to pain. The absence of overlaying cap has resulted in th...  Read Full »

Why am I having pain and pus in an RCT-treated tooth?

Query: Hello doctor, I had undergone a root canal treatment on a tooth two years ago. A few days back it started to pain and I came to know there was an infection in the same tooth. It was discovered that the pus was coming from the inner side of the tooth. The dentist just placed cotton on the affected t...  Read Full »


Dr. Honey Nandwani

Answer: Hello, Welcome to icliniq.com. Thanks for the query. I request you please upload your x-ray here as it will give me a clear picture and I will advise you on how you should proceed. For now, continue taking the medicines as suggested by your dentist. Hope it helps. Thanks and regards.  Read Full »

My root canal-treated tooth broke. What should I do?

Query: Hi doctor, I had a root canal done some years ago. Now, the tooth has broken off. I can still feel some screw in the gum. I am now getting some constant puffiness and bleeding.  Read Full »


Dr. Geethanjali. S. S

Answer: Hi, Welcome to icliniq.com. I have read your complaint. Firstly I would like to say that you do not have any screws unless you have done an implant. It is the broken tooth root which you might feel sharp. That is again the reason for bleeding as it irritates the gums around. The root canal treat...  Read Full »

I have pain in my RCT treated tooth. Please help.

Query: Hello doctor,I had a root canal on a tooth a few years ago (upper left 5) with a deep filling. Last week the tooth broke in half, so I visited my dentist. He removed the other half as it was damaged beyond repair, leaving me with just the root of the tooth, which had previous root canal treatment. H...  Read Full »


Dr. Muzaffer Hussain Parray

Answer: Hello, Welcome to icliniq.com. I have gone through your question I can understand your concern. If the pain and swelling are not going off, you may be resistant to Amoxicillin (Amoxicillin trihydrate) antibiotics. You need to take it thrice daily for at least five days. Suppose after 48 hours; the s...  Read Full »

Why do I get pain in my lower tooth only while going to sleep?

Query: Hi doctor, I am having pain in my lower tooth whenever I go to sleep. Due to lockdown, I am unable to consult the dentist. Can you please tell me any tablet that I can use in the meantime.  Read Full »


Dr. Ummah Mohammad

Answer: Hello, Welcome to icliniq.com. Sorry for the pain you are bearing because of the prevailing situation. As you have already mentioned there is a cavity and when it reaches up to the pulp there develops an irreversible stage which generally is more painful during night time as we sleep. I think your t...  Read Full »

I am getting blisters frequently near a root canal-treated tooth. Why?

Query: Hi doctor, I am a 23-year-old male. I had a root canal treatment two years back. I am getting blisters near that tooth frequently, which is painful. Kindly help.  Read Full »


Dr. Anjana. G.

Answer: Hi, Welcome to icliniq.com. I understand your concern. A blister is a pus-filled sac called an abscess. It indicates the presence of infection around the root of the corresponding tooth. It can be due to the following causes: 1. Incomplete root canal treatment (RCT). 2. Persistent periapical les...  Read Full »

Do I need to get the infected teeth removed?

Query: Hello doctor, My dentist said that I should remove both teeth in the photo due to them being infected. Both the teeth have their nerves removed and one is broken. I would like to ask for a second opinion as I worry that I will have issues with chewing after the removal due to the position of the te...  Read Full »


Dr. Honey Nandwani

Answer: Hi, Welcome to icliniq.com. I have viewed your X-ray (attachment removed to protect patient identity). It looks very clear that the teeth are infected and the root canal treatment that is done is not appropriate. The teeth need to be re-treated or removed but the line of treatment depends on cert...  Read Full »

I have an infection in my RC-treated tooth. What to do?

Query: Hi doctor, I underwent dental treatment twice, which resulted in incomplete fillings and infection near and around the bones. At first, the doctor said the tooth might decay and should be extracted in time because it affects branching nerves and teeth. Besides that, as I was younger, the doctor advi...  Read Full »


Dr. Rakshana Devi M

Answer: Hi, Welcome to icliniq.com. I suggest you take a radiograph and consult me for further details. Also, take an orthopantomogram to verify the position of the nerves. Then do take antibiotics and pain killers for three days. Then continue with the procedure. If it cannot be re-treated with RCT (root c...  Read Full »

ask-doctor-img Ask a Doctor Online

* Your first query consult is free!

Search for a Health Issue



Disclaimer: No content published on this website is intended to be a substitute for professional medical diagnosis, advice or treatment by a trained physician. Seek advice from your physician or other qualified healthcare providers with questions you may have regarding your symptoms and medical condition for a complete medical diagnosis. Do not delay or disregard seeking professional medical advice because of something you have read on this website. Read our Editorial Process to know how we create content for health articles and queries.