How Is Root
Canal Done?

Patients ask me "how is root canal done" almost every day.

A root canal procedure is a dental treatment to get rid of (and hopefully prevent any return of) infection inside a tooth, where the nerve has become damaged or inflamed, or even died. In different countries around the world it can be called a "root canal", a "root filling", or simply "root treatment".

A dentist holding a plastic molar for root canal procedure practice.practising root canal procedure on a model tooth

A root canal procedure is normally done to save a tooth, when it would otherwise have to be taken out. We sometimes use the term 'a hot tooth' to describe a tooth where the nerve is inflamed irreversibly. It involves cleaning out the tiny spaces inside a tooth where the nerve is. Then sealing up those spaces to prevent bacteria getting back in.

Root canal treatment is very demanding work for a dentist. It involves working in tiny spaces inside a tooth, the thickness of a human hair. Specialists will use a surgical microscope. Doing the treatment to a high standard means spending lots of time. Root canal treatment is one of the most technically demanding treatments for a dentist to do well.

How Is Root
Canal Done?

Here is an X-ray of two molars that have had root canal procedures. The root fillings are the white lines inside the roots, in the middle of each tooth. The tooth on the right of the picture is a normal tooth.

An X-Ray of two molar teeth with white lines in the roots, indicating root fillings.

How is root canal done? What was involved in carrying out the root treatments in the photos above?

  • Then we have to position a small rubber sheet over the tooth, with the tooth poking out through a small hole. This is like a surgical drape to prevent saliva getting into the tooth during the root canal procedure. It is also called "rubber dam" by dentists.

A green dental Rubber Dam applied to expose the upper right teeth on a young dental patient.A dental rubber dam in position.
  • Next, the dentist has to make a small hole in the biting surface of the tooth, so that he can get to the tiny spaces deep in the middle of the tooth where the nerve is (or was, if it has died).
  • The next steps take the most time. The dentist has to track down every little canal inside each root. For a molar, this can be between 3 and 6 canals! The dentist has no way of knowing how many canals a tooth has. He must search carefully for as many as he can find.
  • Once he has located a many canals as possible, he must clean them out totally, using tiny instruments and disinfectants.
  • Once the canals deep inside the tooth are clean, they must be sealed up to prevent bacteria getting back in. This is the actual "root filling".
  • Finally, the dentist must seal up the hole he made at the start with a perfect filling. Sometimes a crown will give a stronger result. Finished!

As a dentist, I have done thousands of root canal procedures in the last 30 years. I have also had TWO molar root canals myself, so I know what it's like to be on the receiving end!

Of course, there are definite reasons WHY a tooth might need root treatment. We don't just do a root canal because we feel like it!

You need a root canal procedure if you are getting toothache symptoms that tell us the nerve inside a tooth is dying, or has already died and is now infected.

Remember to check out my top recommended electric toothbrush, which has the best performance and a great price at Amazon - the Cybersonic 3 brush.

cybersonic 3 toothbrush

Here are some links to more specific pages about Root Canal.

Root canal symptoms are usually very clear. It's obvious which tooth is causing the pain and needs treatment. But once in a while the symptoms can be confusing. It can feel like several teeth are all hurting at once! If you're having severe pain you may need Emergency Root Canal.

You can read more about this at my Pulpitis page. It goes into a bit more detail about the exact differences between a reversible toothache and a non-reversible one; Pulpitis is also the cause of a 'hot tooth'.

However when you have an Infected Root Canal , you will be able to identify the exact tooth very easily. A tooth with a root canal infection is normally very tender to bite on. You can put your finger on the exact tooth without hesitation.

Root canal treatment is also one option for a dead tooth. A Dead Tooth does not have any nerve inside it, because the nerve has died, and the tooth will become infected at some point. A dead tooth will also gradually get darker over time, so the sooner it has a root canal treatment, the better the chance of it staying white!

When I tell a patient that a tooth is in trouble, one of the first questions is frequently about the alternatives to root canal. The alternatives are few. It really boils down to having the tooth taken out or trying to save it with root canal treatment. Here is some information about Getting a Tooth Pulled.

Molar root canal is the most technically difficult of all root canal treatments. It takes the most time and so costs more than for other teeth. It is not unusual for a dentist to refer molar root canal to an endodontist.

Because of the complexity of root canal treatment, there's a few things that can go wrong. So there can also be Root Canal Complications! There are many potential problems, even with apparently straightforward cases.

Sometimes, we can be faced with an emergency root canal. In this situation the dentist has to act quickly. This can happen when someone has had an accident, breaking a tooth. OR where a tooth has become infected, and an abscess develops overnight.

How is root
Canal Done?

Root canal costs are always a consideration when faced with the need for treatment. The cost of root canal depends on several things, such as which tooth is involved, ie. front tooth or molar. Generally, back teeth are more complicated and so cost more than front teeth.

In about 5% to 10% of cases, there may be a Root Canal Failure. This can be caused by several things, some of them preventable. A root canal failure is not necessarily malpractice! Sometimes it is possible to salvage a failure with Root Canal Surgery.

There is always a chance of Pain After Root Canal in certain situations. It's not unusual to have some discomfort after a root canal procedure for a few days. I recommend Tylenol or Ibuprofen until things settle.

A root canal procedure should be painless during the actual treatment in the dentists office. A frequent question from patients is "Do root canals hurt?" The answer is "NO, a root canal treatment should NOT hurt!"

Here is a guide to Dental Anesthetics particularly with regard to root canal treatment. It explains how to get a painless shot, and what the dentist should do to make sure the tooth is numb!

Root canal treatments have a very high chance of success. In fact, compared to most medical procedures, dental treatment generally has very good success rates!

After a tooth has been saved with a root canal treatment, it must be sealed up to prevent bacteria from saliva getting back in. One way to do this is with a Root Canal crown.

One potential problem with root canal crowns is that we sometimes need to put a small post into the top of the root canal, to give the crown something to sit on. Unfortunately this can weaken the root, and increase the risk of a cracked tooth root. You can see some pictures of this at Cracked Tooth Root Photos.

Finally, there are also some very out-of-date views about trying to save teeth with root treatment. A tiny number of people feel that dentists are covering up root canal danger. I have written about this misguided opinion only to expose how stupid it is.

Finally, I hope I have explained the answer to the question "how is root canal done"!

You might like these

Back to Top

  1. Dental Advice
  2. Root Canal Procedure