What is a root canal?

What is inside a tooth

A tooth is not a solid block. Outside there is enamel, under that dentin, and at the center a chamber of soft tissue: the pulp, holding the nerve and the blood vessels that feed it.

That pulp runs down inside the root through narrow channels. That is where the name comes from — the treatment works in exactly those canals.

When it is needed

When the pulp becomes inflamed or infected. It gets there several ways: decay that advanced far enough, a fracture that opened a path for bacteria, a knock — sometimes years earlier — or a tooth that has been through many treatments.

Inflamed tissue inside a rigid chamber has nowhere to expand, and that pressure produces the characteristic pain: intense, hard to pinpoint, worse lying down, and it keeps you awake.

What the procedure involves

Told plainly, the treatment goes like this:

• An X-ray to see the root and how far the problem has gone
• Local anesthesia, until the area is completely numb
• The tooth is isolated so the work happens in a clean field
• An access is opened at the top and the damaged tissue is removed
• The canals are cleaned and disinfected
• They are sealed so bacteria cannot recolonize them
• The access is closed and, later, the tooth is protected

Why the bad reputation

The reputation comes from two places. One is decades old, when anesthesia and instruments were a different matter. The second, and this is the important one, is that people associate a root canal with the pain they had before they walked in.

You arrive at a root canal in pain. You leave without it. The treatment does not cause that pain — it ends it. It is done under anesthesia, and not feeling the procedure is the norm.

Some tenderness in the following days is normal, especially when biting, while the ligament around the root settles down. It usually responds well to ordinary painkillers.

The crown afterwards is not optional

A tooth that has had a root canal is more brittle: internal tissue has been removed and it no longer gets the hydration the pulp provided. In back teeth, which take the force of chewing, that means a real risk of fracture.

That is why the treatment is usually completed with a crown to protect it. Leaving it unprotected is the most common reason a well-done root canal is lost years later.

The alternative

When a root canal is not done, the usual alternative is removing the tooth. And that is not the end of it: the gap changes the bite, neighboring teeth drift, and the tooth generally needs replacing with an implant or a denture.

Put that way, keeping your own tooth is usually the simpler path, even if it sounds worse at first.