Root Canals

Understanding Root Canals: Save Your Natural Teeth with Endodontic Therapy

Root Canals

Root canal therapy fits under the special dentistry area known as endodontics. Endodontics literally means den­tistry within the tooth itself. The procedure treats disorders of the pulp (the soft tissue inside the crown and roots made up of blood vessels, nerves and lymph vessels that help keep your tooth nourished). Endodontic treatment restores your tooth to a comfortable state by removing the damaged tissue and replacing it with a substance that will help preserve the function of the tooth.


There are many reasons that a root canal may be needed but the most common cause is the carious process (the uncon­trolled process of tooth decay). When tooth decay begins, it penetrates the outer layer of enamel and creates a cavity. If that process is not stopped, the decay will continue toward the nerve of the tooth.


Other causes include a frac­ture that exposes the pulp, traumatic injury such as a blow to a tooth, a cracked or loose filling or repeated fillings in a tooth, and occasionally from periodontal (gum) disease. Regardless of the initial cause, the tooth pulp becomes irri­tated and an abscess (infection) can occur. Bacteria from your saliva grow within the tooth pulp, causing pressure and pain. Eventually the pulp dies, causing the bone around the tooth to be destroyed.

All dentists receive some training in endodontic therapy; however, you may be referred to an endodontist, a special­ist who limits his/her practice to root canal procedures. The sooner you get treatment, the better; your risk of losing the damaged tooth is decreased, your pain can be relieved and your dentist may prevent infection from spreading further.

A Tooth Tour

Partial Dentures– A removable partial denture or bridge usually consists of replacement teeth attached to a pink or gum coloured plastic base, which is connected to a metal framework that holds the denture in place. Partial dentures are used when 1 or more natural teeth remain in the upper or lower jaw.

The Procedure

Once it has been determined (with X-rays and clinical examination) that root canal treatment is necessary, you will be scheduled for 1 or more appointments. Your vis­its may last 1 to 2 hours and you may receive local anesthesia. A rubber dam (a protective sheet of rubber that covers your mouth) may be used to isolate your tooth and prevent bacteria from entering it. The goal of the root canal therapy is to improve the health of your damaged tooth by removing the pulp from your root canals through a small opening in the crown. Then the canals are sealed with special materials to prevent bacteria from reaching your bone. Your dentist then restores the outside of your tooth so it will function properly and have a healthy appearance. After root canal therapy your tooth contin­ues to be nourished by your surrounding gums and bone.

Care Following Treatment

Filling Your Root Canals

After the pulp has been removed from your root canals and they have been smoothed, your dentist may fill the canals with tiny, cone-shaped pieces of gutta-percha – a firm, rubber-like material – or use another dental material. A sealer-cement is used to seal the filling material into place.

Cleaning & Shaping Your Root Canals

First, your dentist makes an opening in your tooth and removes any filling and decay. Then the unhealthy pulp is removed with tiny, flexible files. By using delicate, up-and-down motions, your dentist gently cleans and smoothes your canals to prepare them for the canal-filling materials.

Restoring Your Tooth

After the inside of your tooth has been treat­ed, the outside will be restored to protect your tooth’s underlying structures and to give it a healthy appearance. If your tooth needs extra support, some of the gutta-percha may be removed and a post inserted before the filling and crown are applied.

Once the root canal treatment has been completed, you should be aware of the following considerations:

  • Discolouration– Occasionally, an endodontically treated tooth may undergo a change in colour. While this is of no great medical concern, you may be interested in having the tooth bleached. Be sure to ask your dentist about tooth bleaching.

  • Brittleness– A non-vital (endodontically treated) tooth is more brittle than a vital one, and is more susceptible to fracture. Therefore, we recommend that your root canal teeth be crowned (capped) following treatment.

Occasionally, a tooth that has under­gone endodontic treatment fails to heal or pain continues despite thera­py. Some of the special complications that can occur include accessory root canals (large side canals coming off the main canal that cannot be cleaned out), badly curved or cracked roots, and narrow canals that prevent thor­ough cleaning and sealing of the dam­aged tooth. Sometimes, for unknown reasons, tissues simply fail to heal or a tooth that initially responds to root canal therapy becomes painful or dis­eased months or years later.

Whatever the cause, retreatment may be necessary in order to save the tooth. During retreatment, the tooth is reopened and the canals are cleaned, filled and sealed again. There are, of course, no guarantees that the procedure will be suc­cessful, but your endodontist can discuss with you the chances of success before the tooth is retreated. Extraction is the only alternative to retreatment and unless the tooth is replaced with an artificial one (an expensive procedure), adjoining teeth will shift, interfering with bit­ing and chewing. Loss of a tooth can also lead to periodontal disease and loss of additional teeth.


To learn more about root canals and whether this procedure may be right for you, please contact us in Ajax, Whitby or Pickering to schedule an appointment.

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