Question:

“I have two root canals one on my upper left and the other on my upper right.  I have experienced episodes of pain in both since having the procedures done ~5 yrs ago. The most recent episode was a continuous sort of throbbing pain that persisted for three days before I decided to go to my dentist.  Each time one of these pain episodes occur my dentist takes x-rays and pokes around but is unable to provide an explanation and prescribes antibiotics.  A few days after taking the antibiotics the pain has dulled and goes away.  I no longer feel that this is an effective method in dealing with a persistent problem.  Antibiotics are discontinuing the pain, antibiotics attack and eliminate bacteria, so bacteria are a likely culprit to causing the pain.  Is a pain causing but not so severe bacterial infection able to be seen in an x-ray?  Should I request that my dentist remove the crown for a more thorough examination or is episodes of pain treated by antibiotics a part of the territory of living with a root canal? Lastly, am I supposed to even feel anything being that the pulp tissue is removed?”

Answer:

To specifically address your question, if the problem is alleviated by antibiotics, that’s a sure sign that there is a bacterial re-contamination.  This can be caused by a number of reasons that are outlined in our older article, called Failed Root Canal.  However, it is not normal for you to be feeling pain 5 years after a root canal.  The purpose of a root canal is to completely remove the source of infection, thus removing the source of pain.  It sounds like there may have been a missed canal (lateral canal, or a small canal at the apex), or a leaky crown, but the bacteria has found some kind of way to reinvade and re-infect the area.  It may be best to visit an Endodontist to have him/her reassess your tooth.  The Endodontist specializes in only root canals and has the technology to more closely examine your tooth condition.  Below we have detailed information regarding root canals.

What is a Root Canal Treatment?

A root canal treatment (also called root canal therapy) is a procedure that is done in order to attempt to save a tooth, usually after it has become badly decayed or infected. If the affected tooth is not treated, the infection or decay will usually spread to the tissues surrounding the tooth, including the bone.

Does a root canal hurt?

In most cases, the procedure is not painful, though there may be some sensitivity afterwards. Most cases of discomfort are felt if there was pain before the procedure (it goes away as the tooth heals), or if there is any complication such as a missed canal. One of the wonderful things about a root canal treatment is that the source of the pain is removed, the canal(s) thoroughly cleaned and disinfected, and the canals filled to prevent re-invasion of bacteria. Many patients retain their root canal treated teeth for life.

It’s important to note too that in most cases where there is discomfort after, the source is not in the tooth itself but in the periodontal ligament (PDL) surrounding the tooth. The infection in the tooth often spreads to the PDL (and in some cases the bone), which by itself is the cause of much sensitivity and discomfort.

What to do after a root canal

The root canal procedure has a success rate ranging between 68-95%. It is a welcome procedure for patients who have the opportunity to try and save their tooth or teeth. After the procedure is completed, a few things to know and expect:

• If there was tooth pain or an infection before the procedure, you may have some sensitivity for a few days after. This is because the tooth is healing from the tooth inflammation that was present before. Your dentist will most likely prescribe NSAIDs for the pain and inflammation. Antibiotics are used to treat oral bacterial infections, in cases where a tooth or teeth may have developed an infection.
• Avoid chewing on the tooth being treated until a permanent crown is placed. This will help you to avoid damaging or re-contaminating the tooth.
• Ensure that you complete the procedure by having a crown (cap) placed over the tooth. This helps protect the tooth from being exposed again to bacteria, and provides structural support and protection for a tooth that is no longer as strong on its own.

Pain years after root canal

Though not very common, there can be root canal pain years later. Reasons for pain after a root canal procedure include:

• Tooth fracture.
• A failed dental restoration (usually a crown) that has allowed bacteria to invade the tooth, causing a re-infection.
• The material sealed inside the canal(s) break down, allowing bacteria to recontaminate the tooth.
• Missed canal – not all canals were located, cleansed, and sealed during the procedure

Failed root canal

After root canal pain, a dentist will re-examine the tooth including the crown to determine the condition of the tooth and what needs to be done. It is sometimes tricky to isolate the problem, but two common approaches to relieving the recurrence of inflammation and infection include:

• A root canal retreat. Re-treatment is sometimes successful, and involves thoroughly cleaning and refilling the canals.
• Endodontic surgery may be needed in other cases. The most common endodontic surgery used to attempt to treat this is an apicoectomy (also called root-end resection or root resection). Basically, the tip of the root and the infected tissue around the root tip are removed. A small filling may be placed at the root tip to seal the root canal.

In extreme circumstances, the tooth may be non-restorable and will need to be extracted. Comprehensive evaluation is necessary for diagnosis and treatment of each patient’s case. Depending on the extent of the infection, changes are sometimes seen on a dental radiograph (dental x-ray) that indicate the presence of an active infection.

We hope this information was helpful to you!

“I just had a root canal treatment in the top tooth, 5th from the middle. It’s been a month since the treatment, and I am having slight pain, it feels slightly loose.  What would you suggest for me to keep my tooth”

Answer:

What is Root Canal Treatment?

A root canal specifically refers to the space inside of the root of a tooth. A tooth may have one or more canals, just as they may have one or more roots.  Root canal treatment (also called root canal therapy or endodontic therapy) involves cleaning out the canal(s), disinfecting the canal(s) and then filling the canal(s).

Why do I need Root Canal Treatment?

Reasons why a root canal treatment may be recommended include:

• Tooth decay that has extended to the pulp
• Exposure of the pulp due to some trauma (this sometimes happens during rigorous sporting activities)
• A tooth that has become infected from decay (known as an abscessed tooth). Sometimes the infection may spread the bone surrounding the tooth.
• Internal resorption

Why does my root canal hurt?

There may be some sensitivity after the procedure, as the tooth heals. Pain after a root canal is not uncommon, though most patients may have no symptoms after treatment. In cases where there is associated pain, some reasons include:

• The associated pain is normal, as the inflammation slowly goes away and the tooth heals.
• There is an extra (much smaller) canal that may still need to be cleaned and filled. Teeth can be weird in this way (extra canals), and even the very best dentist can miss these hidden canals. This is usually corrected by the dentist or endodontist (a dentist who specializes in root canal treatment).
• The pain may actually be originating from the periodontal ligament surrounding the tooth.
• The root canal has failed, and a re-treat or endodontic surgery (also called root canal surgery) may be needed. If there is a dental infection at the root apex (tip), then an apicoectomy (which just means root tip removal) may be necessary.
• The tooth could have been fractures or perforated during the procedure.  Performing a root canal places a lot of pressure on the tooth.  Sometimes, if the tooth is weakened, it may fracture.  This could very well be the cause of your pain and looseness of the tooth.

Remember that each patient’s case is different, so diagnosing and treating depends on individual cases. Please see your dentist as soon as possible for evaluation to determine necessary treatment.

We hope this was helpful to you!

Question 1:

Why do root canal treatments fail?… What will be the solution to save the tooth again? [Are there] any good options?
Please share the good thoughts.

Question 2:

If root canal treatment failed – what will be next option to save the tooth?

Answer:

Today we had two similar questions from readers so we will address both.

Root canal treatments do not have a 100% success rate.  The success rate actually varies between 68% -95% depending on several factors involved including the presence of bacteria, the vitality of the tooth, etc.  A root canal treatment is just an alternative method to save a tooth when its pulp has become infected with bacteria.

Why do root canals fail?

They can fail for several reasons.  Some include:

• Bacteria left in the canal
• A “leaky” filling
  • This leaves pathways for bacteria to reinfect the tooth
• Missed canals
  • Sometimes teeth have extra or sneaky canals that aren’t easily found on an xray.  If the canal is missed during root canal treatment, there is a possibility of failure
• Systemic conditions
  • Other illnesses such as diabetes or complicated medical conditions can affect the success rate of treatment
• The tooth is fractured or have a crack

What’s the next step after root canals fail?

The reason of failure will determine the next step in treating a failed root canal.  Here are some options:

• Re-treatment
  • This includes removing the old root canal material in the canals (gutta percha), recleaning the inside of the tooth, disinfecting the inside again, and placing new material
• Apicoectomy
  • This is a dental surgery that involves removing just the tip of the root.
• Extraction+ replacement
  • If all else fails, the tooth can be removed and replaced with an alternative including a bridge, implant, or removable appliance.

Root canal treatments are a great way to treat a seriously infected tooth.  Unfortunately, some fail and other treatment modalities have to be introduced.  We hope this information helps in your understanding for treatment failures and alternatives.

Good luck,

SaveMySmile Team

Good luck!