Root Canal Retreatment
With proper care, most teeth that have had endodontic (root canal) treatment can last as long as other natural teeth. In some cases, however, a tooth that has received endodontic treatment fails to heal or the pain continues. Occasionally, the tooth becomes painful or diseased months or even years after successful treatment.

If your tooth has failed to heal or has developed new problems, you have a second chance. Another endodontic procedure may be able to save your tooth.

When previous root canal therapy fails and must be retreated, patients usually have many questions.

Why do I need another endodontic procedure?
As occasionally happens with any dental or medical procedure, a tooth may not heal as expected after initial treatment for a variety of reasons:

  • The restoration did not prevent saliva from contaminating the inside of the tooth, also known as "coronal leakage."
  • A loose, cracked, or broken crown or filling can expose the tooth to new infection.
  • Narrow or curved canals were not treated during the initial procedure.
  • Complicated canal anatomy went undetected in the first procedure.
  • The crown or other restoration was not placed soon enough after the procedure.
  • 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.

What will happen during retreatment?
We will need to reopen your tooth to gain access to the root canal filling material, and as mentioned before, 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, searching for any additional canals or unusual anatomy that requires treatment. After cleaning the canal(s), we will fill and seal the canal(s) and place a temporary filling in the tooth. After the final visit with us, 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 full function.

*If the canals are unusually narrow or blocked, we may recommend endodontic surgery. This surgery involves making an incision near the end of the root to allow the tip of the root to be sealed. (See "endodontic surgery")

Is retreatment the best choice for me?
Retreated teeth can function well for years, even for a lifetime. It's always best to save the tooth if we believe retreatment is the best option for you.

Advances in technology are constantly changing the way root canal treatment is performed, so we may even be able to use a new technique that was not available when you had your first procedure. If your tooth has unusual anatomy that was not cleaned and sealed during the first procedure, we may be able to resolve this problem with a second treatment.

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

How much will the procedure cost?
The cost varies depending on how complicated the procedure will be. The procedure will probably be more complex than your first root canal treatment, because your restoration and filling material may need to be removed to accomplish the new procedure. In addition, we may need to spend extra time searching for unusual canal anatomy. Therefore, you can generally expect retreatment to cost more than the initial endodontic treatment. While dental insurance may cover part or all of the cost for retreatment, some policies limit coverage to a single procedure on a tooth in a given period of time. Our office can help you check with your employer or insurance company prior to treatment to be sure of your coverage.

What are the alternatives to retreatment?
For some patients considering retreatment, endodontic surgery is also an option. This surgery involves making an incision near the end of the root to allow the tip of the root to be sealed. Endodontic surgery may be recommended in conjunction with retreatment or as an alternative. We will discuss your options and recommend appropriate treatment. The only other alternative is extraction of the tooth. The extracted tooth must then be replaced with an implant, bridge, or removable partial denture to restore chewing function and to prevent adjacent teeth from shifting. Because these options require extensive surgery or dental procedures on adjacent healthy teeth, they can be far more costly and time consuming than retreatment and restoration of the natural tooth.

No matter how effective modern tooth replacements are - and they can be very effective - nothing is as good as your natural tooth. You've already made an investment in saving your tooth. The payoff for choosing retreatment could be a healthy, functioning natural tooth for many years to come.

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