Risks of Root Canal Failure vs. Tooth Infection: What You Need to Know

TL;DR:

Can a failed root canal kill you? Not directly.

The real danger comes from the untreated tooth infection or abscess that may remain after a failed root canal or delayed treatment.

This blog explains why root canals are generally considered safe, how infections become dangerous, and what failed root canal symptoms you should never ignore.

• Root canals are designed to remove infection and preserve your natural tooth.
• Severe complications are typically caused by untreated tooth infections — not the root canal procedure itself.
• Failed root canal symptoms may include swelling, recurring pain, fever, gum abscesses, and facial tenderness.
• In some cases, additional endodontic treatment or tooth extraction may be necessary to fully eliminate infection.
• Prompt treatment greatly reduces the risk of serious complications and helps protect your long-term oral health.

Wondering if a failed root canal can kill you? The answer is no, at least, not directly.

While all surgery involves some level of risk, getting a root canal is generally pretty safe. If you’re wondering about whether failed root canal symptoms can be dangerous, however, the answer is yes.

Many people asking questions like “Can a failed root canal kill you” or “Can an untreated root canal kill you?” are really asking a bigger question: “Exactly how dangerous can a tooth infection become if it isn’t fully treated?”

The important thing to know is that root canal treatment itself is no more dangerous than any other type of oral surgery. In fact, root canals are specifically designed to remove infection.

Sometimes, a root canal may fail to completely resolve the initial infection. Other times, the tooth may become reinfected later on. Either way, this can become dangerous, and in relatively rare cases, even lead to death.

The good news is that if you know what failed root canal symptoms to be on the lookout for, you can generally have additional dental work performed, such as a tooth extraction, to eliminate the infection and associated risk.

Why Tooth Infections Become Dangerous

When an abscessed tooth, or pocket of bacterial infection, spreads beyond the tooth and into surrounding tissues, it can be dangerous if it not properly treated. Specifically, in rare, advanced cases, untreated dental infections may spread into:

• The jawbone
• Facial tissues
• The neck
• Nearby sinus cavities
• The bloodstream

As the NHS explains, root canal treatment is specifically intended to remove existing infection from inside the tooth and prevent reinfection.

But when root canal is delayed or isn’t fully successful, the above issues can occur. This is precisely why dentists and endodontists stress the importance of treating tooth infections early instead of waiting for symptoms to worsen.

Root Canals Usually Prevent Serious Complications

Root canals carry risk like any surgery, but they are not generally considered dangerous procedures. More often than not, they help prevent severe infection-related complications, rather than being the cause of them.

As The American Association of Endodontists (AAE) note, there is no scientific evidence linking properly treated root canals to disease elsewhere in the body. What’s more, having a root canal performed is designed to:

• Eliminate bacteria from the infected tooth
• Relieve pain and inflammation
• Prevent reinfection
• Preserve the natural tooth whenever possible

Unfortunately, extremely outdated research that connects root canals to systemic illness continues to circulate, despite the research being from the early 1900s, and despite it having been completely discredited long ago.

Root Canal vs. Extraction: Why Endodontists Usually Try to Save The Tooth First

When a root canal does fail, it usually indicates that a more invasive procedure such as a tooth extraction is required. It does not usually indicate that the procedure itself caused harm, however.

If issues surrounding infection risk often remain due to root canal not being sufficient, you may be wondering why an endodontist wouldn’t recommend extracting, or pull out, the infected tooth in the first place.

There are several good reasons. For one thing, extraction leaves a gap whereas root canal does not. This can result in:

• Shifting teeth
• Bite alignment issues
• Difficulty chewing
• Additional dental procedures
• Higher long-term costs

Tooth extraction is often more uncomfortable than a root canal as well. But perhaps even worse, it sometimes results in the need to get bridges, implants, bone grafts, or other restorative work done, which can get very expensive very quickly.

By contrast, when starting with a root canal, you preserve the original tooth and the surrounding tissue, and if it’s successful, that is generally all that is required. What’s more, if successful, a root canal has many benefits including the following:

• Maintaining chewing efficiency
• Preventing neighboring teeth from shifting
• Preserving your natural smile
• Reducing the need for additional procedures
• Supporting long-term oral health

Failed Root Canal Symptoms You Shouldn’t Ignore

It’s important that you be able to easily identify the following failed root canal symptoms early in order to prevent a more serious infection from developing:

• Persistent or returning tooth pain
• Pain while chewing or biting
• Swollen or tender gums
• Facial swelling
• A pimple-like bump on the gums
• Bad taste or foul odor in the mouth
• Tooth discoloration
• Fever or swollen lymph nodes

Note: These symptoms do not automatically indicate a medical emergency. They do indicate the need for prompt dental evaluation, however. If you are experiencing any of the above, reach out ASAP.

How Soon Can You Tell If a Root Canal Failed?

Some root canal failures become obvious quickly. Others develop slowly over time. Symptoms may appear:

• Within days after treatment
• Weeks later
• Months later
• Even years after the original procedure

You should contact a dentist or endodontist if pain or swelling returns any time after a root canal.

We Can Help with a Tooth Infection or Failed Root Canal

Can a failed root canal kill you? Now you know! The issue is not the root canal but the untreated infection or abscess that may continue spreading if the tooth does not sufficiently heal.

In these cases, additional treatment may be necessary, but usually prompt care greatly reduces the risk of serious complications. Death from root canal related complications is rare.

That said, if you experience failed root canal symptoms like recurring pain, swelling, fever, or a gum abscess, do not ignore them; consult your endodontist regarding endodontic treatment immediately.