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Root Canal Treatment

Root canal treatment (also called a root canal) is done when decay will likely damage or has already killed a tooth. During a root canal, a dentist or endodontist removes the pulp from the center of a tooth and fills the pulp cavity. This can prevent the development of a painful infection in the pulp that may spread to other teeth. A root canal can also treat an infection that has developed into an abscessed tooth. This procedure can relieve toothache, stop infection, and promote healing.

A general dentist or one who specializes in diseases of tooth pulp (endodontist) can perform a root canal.

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  • First, the dentist will numb your gums with a substance that feels like jelly. After your gums are numb, the dentist will inject a local anesthetic that will completely numb the teeth, gums, tongue, and skin in that area. Sometimes nitrous oxide gas will be used to reduce pain and help you relax.
  • The dentist may separate the decayed tooth from the other teeth with a small sheet of rubber on a metal frame. This protective rubber sheet also helps stop liquid and tooth chips from entering your mouth and throat.
  • The dentist will use a drill and other tools to remove the pulp from the tooth and will fill the inside part of the tooth below the gum line with medicines, temporary filling materials, and a final root canal filling.
  • After the root canal, a permanent filling or crown (cap) is often needed. If a crown is needed, the dentist removes the decay and then makes an impression of the tooth. A technician uses the impression to make a crown that perfectly matches the drilled tooth.
  • The tooth may be fitted with a temporary crown until the permanent crown is made and cemented into place.

What To Expect After Surgery

After a root canal, your lips and gums may remain numb for a few hours until the anesthetic wears off. Later you may have throbbing pain, which you can treat with pain medicines, such as ibuprofen, acetaminophen, or a stronger prescription painkiller. Be safe with medicines. Read and follow all instructions on the label. The pain usually lasts only a day or two.

Crowns that seal the top of the tooth and strengthen it may come loose over time. They may need to be repaired, redone, or cemented on again.

Why It Is Done

A root canal is needed when tooth decay is likely to cause permanent damage to the pulp or has already done so.

How Well It Works

A root canal removes the pulp inside the tooth and replaces it with filling material. It can effectively treat or prevent an infection.

Risks

If you have an infected tooth, bacteria from the mouth can enter the bloodstream and cause infections in other parts of the body. People who have a hard time fighting off infections may need to take antibiotics before and after a root canal. Such people include those who have artificial heart valves or were born with heart defects.

What To Think About

Because a root canal removes the pulp inside the tooth, the tooth becomes more fragile and may break more easily if it is not covered with a crown or cap.

A root canal needs to be done as soon as possible to avoid a severe infection, which can damage the bone surrounding the root of the tooth and infect other teeth.

If you have a severely decayed or infected tooth, you may not want to go through the expense and discomfort of a root canal and crown fitting. Instead, you may choose to have the tooth removed (extracted). The space can be left open or restored with a fixed or removable bridge camera.gif.

Complete the surgery information form (PDF)(What is a PDF document?) to help you prepare for this surgery.

By Healthwise Staff
Primary Medical Reviewer Sarah Marshall, MD - Family Medicine
Specialist Medical Reviewer Steven K. Patterson, BS, DDS, MPH - Dentistry
Last Revised January 24, 2013

WebMD Medical Reference from Healthwise

Last Updated: January 24, 2013
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.

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Only 18.5% of Americans never floss. You are missing out on a simple way to make a big difference in the health of your mouth. Regardless of how well you brush, plaque still forms between your teeth and along your gums. Floss removes food trapped between the teeth and removes the film of bacteria that forms there before it turns to plaque, which can cause inflamed gums (gingivitis), cavities, and tooth loss. Try flossing just one tooth to get started.

You are one of 31% of Americans who don't floss daily. You are missing out on a simple way to make a big difference in the health of your mouth. Regardless of how well you brush, plaque still forms between your teeth and along your gums. Toothbrush bristles alone cannot clean effectively between these tight spaces. Flossing removes up to 80% of the film that hardens to plaque, which can cause inflamed gums (gingivitis), cavities, and tooth loss. Aim for 3 more days!

You are one of 31% of Americans who don't floss daily, but you're well on your way to making a positive impact on your teeth and gums. Regardless of how well you brush, plaque still forms between your teeth and along your gums. Toothbrush bristles alone cannot clean effectively between these tight spaces. Flossing removes up to 80% of the film that hardens to plaque, which can cause inflamed gums (gingivitis), cavities, and tooth loss. Aim for all 7 days!

Only 50.5% of Americans floss daily, and good for you that you are one of them! Regardless of how well you brush, plaque still forms between your teeth and along your gums. Toothbrush bristles alone cannot clean effectively between these tight spaces. Flossing removes up to 80% of the film that hardens to plaque, which can cause inflamed gums (gingivitis), cavities, and tooth loss. Congratulations on your good oral health habit!

SOURCES:

American Dental Association, Healthy People 2010

This tool is intended only for adults 18 and older.

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