Ans.Root canal treatment is generally safe and effective and lasts for a long time. This endodontic treatment has success rate is more than 85 to 97%. Top dentists in Mumbai use ensure that you get the best RCT treatment to ease the pain and swelling in your tooth. But minute chances of RCT failure can happen occasionally. 

The failure of this endodontic treatment may occur due to:

• The treatment has not done up to the acceptable standards.
• Perpetual microbial infection in the root canal system.
• Missed canal.
• Improper and incompletely treated root canal, due to complexity of shape or ledges.
• Breakage of file during treatment and not able to retrieve it.
• No crown/cap or breakage of it.
• Remaining tissue.
• Bacterial post treatment leakage.

The sign and symptom of RCT  failures may appear many years after the treatment was completed. These symptoms may be:

• Pain
• Tenderness on biting.
• Swelling near the treated tooth.
• Pus discharge.
• Sensitivity of the tooth.
• Treated tooth discolouration.
• Sinus problem.

Untreated failed root canal can lead to a dangerous infection, and even serious complications. Re-treatment can be done to correct it or the tooth may be extracted.