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Endodontic Retreatment

Endodontic Retreatment 

Statistics show that root canal therapy is highly successful, and even more so when performed by an endodontist. However, some teeth do not heal properly and may become painful or diseased again. Antibiotics cannot permanently resolve a root canal that is re-infected. Treatment options are retreatment or extraction.

Reasons why a tooth may become symptomatic again 

As occasionally happens with any dental or medical procedure, a tooth may not heal as expected after initial treatment for a variety of reasons:

  • Narrow or curved canals were not treated during the initial procedure. 
  • Complicated canal anatomy went undetected in the first procedure. 
  • The placement of the crown or other restoration was delayed following the endodontic treatment. 
  • The restoration did not prevent salivary contamination to the inside of the tooth. 


In other cases, a new problem can jeopardize a tooth that was successfully treated. For example:

  • New decay can expose the root canal filling material to bacteria, causing a new infection in the tooth. 
  • A loose, cracked or broken crown or filling can expose the tooth to new infection. 
  • A tooth sustains a fracture. 



How is endodontic retreatment performed? 

First, we will discuss your treatment options. If you choose retreatment, we will reopen your tooth to gain access to the root canal filling material. In many cases, complex restorative materials—crown, post and core material—must be disassembled and removed to permit access to the root canals. 




After removing the canal filling, we can clean the canals and carefully examine the inside of your tooth using magnification and illumination, searching for any additional canals or unusual anatomy that requires treatment. The Gentlewave Procedure will again be used to further disinfect the canals.




After cleaning the canals, the tooth will be filled and the canals sealed prior to place either a temporary filling or permanent restoration in the tooth. If the canals are unusually narrow or blocked, additional endodontic surgery may be indicated. This surgery involves making an incision to allow the other end of the root to be sealed. 





After endodontic retreatment is completed, you will need to return to your dentist as soon as possible to have a new crown or other restoration placed on the tooth to protect and restore it to its full function. 






Is Retreatment the Best Choice for Me? 

Whenever possible, it is best to save your natural tooth. Retreated teeth can function well for years, even for a lifetime. 

Advances in technology are constantly changing the way root canal treatment is performed, so new techniques may be utilized that were not available when you had your first procedure.  

As with any dental or medical procedure, there are no guarantees. We will discuss your options and the chances of success before beginning retreatment. 

Will I feel pain during or after the procedure? 

Many endodontic procedures are performed to relieve the pain of toothaches caused by pulp inflammation or infection. With modern techniques and anesthetics, most patients report that they experience no pain during the procedure. Nitrous oxide and oral sedation options are also available to patients who may feel anxious.  

For the first few days after treatment, your tooth may feel sensitive, especially if there was pain or infection before the procedure. This discomfort can be relieved with over-the-counter or prescription medications. It is normal that your tooth may continue to feel slightly different from your other teeth for some time after your endodontic treatment is completed.  

Most patients experience little to no discomfort after treatment. Every patient will also be provided with Dr. Chung’s direct cell phone number after treatment so that you can easily reach her at any time if needed.