Most root canal myths are decades out of date, and they keep people sitting in pain when a simple treatment would fix things. Here are the 7 we hear most often at the chair, each one stated plainly and then set straight. The reality is a lot less scary than the rumour.
The root canal myths that cost people their teeth
A root canal saves a tooth that would otherwise have to come out. That's the whole point of it. But a pile of root canal myths, most of them left over from how dentistry was done 30 years ago, scare people away from a treatment that's now routine and comfortable. We've watched patients lose teeth they could have kept, all because of something a neighbour told them. So let's clear the air with the actual root canal facts. People often ask the same nervous question first, is RCT safe, and the short answer is yes, it's one of the most routine procedures in dentistry. Here are 7 myths, busted one by one.
Myth 1: A root canal is unbearably painful
This is the big one, and it's wrong. The pain people fear is the pain of the infection before treatment, not the treatment itself. With modern local anaesthesia, the procedure feels much like getting a filling. Most patients are surprised at how little they feel. The root canal is what ends the pain, not what causes it. Our honest breakdown of what a root canal really feels like goes into the details if you want them.
Myth 2: It's better to just pull the tooth out
Extraction sounds simpler, but it leaves you with a gap, and gaps cause trouble. The neighbouring teeth drift, the opposite tooth over-erupts, and the bone underneath shrinks. Then you're looking at an implant or bridge that costs far more than the root canal would have. Saving your natural tooth is almost always the better long-term call. Nothing works quite like the tooth you were born with.
There's a cost angle too. A root canal with a crown costs less than pulling the tooth and replacing it with an implant later. People reach for extraction thinking it's the cheaper, simpler path, and end up spending more once they factor in the replacement. So the maths usually favours saving the tooth, not just your health.
Myth 3: Root canals cause illness elsewhere in the body
This one comes from a debunked study from the 1920s that's been floating around ever since. There's no sound evidence that a properly done root canal causes disease elsewhere in the body. The procedure removes infected tissue and seals the tooth, which reduces infection, not spreads it. Leaving an infected tooth untreated is the actual health risk.
Myth 4: A root canal takes many long appointments
Not anymore. With rotary instruments, many root canals are now done in a single sitting. A straightforward case can be finished in one visit. More complex teeth, or ones with active infection, may need 2 visits, but the days of endless appointments are gone. You can read how this works in our guide to single-sitting root canal treatment.
Myth 5: If the tooth doesn't hurt, it doesn't need a root canal
A dying tooth nerve doesn't always announce itself with pain. Sometimes the nerve dies quietly and the infection spreads to the bone with no warning ache. Your dentist may spot it on an X-ray during a routine checkup. So a tooth flagged for a root canal that feels fine right now still needs treatment. Waiting for pain is waiting too long. By the time it does hurt, you've often crossed from a simple root canal into swelling, an abscess, or an emergency visit at the worst possible hour.
Myth 6: A crown afterwards is just the dentist upselling
A back tooth that's had a root canal becomes more brittle, because the nerve and blood supply inside are gone. Chewing forces can crack it. A crown protects that weakened tooth and is genuinely part of the treatment, not an add-on. Skipping the crown is one of the most common reasons a root-canalled tooth fails later. It's not a sales tactic. It's what keeps the tooth in your mouth.
Myth 7: Root canals don't last
A well-done root canal with a proper crown on top can last decades, often a lifetime. The tooth functions like any other. When a root canal does fail, it's usually because the crown was skipped, the seal broke down, or new decay crept in. Look after it like a natural tooth and it'll serve you for years.
So when do you actually need one?
You might need a root canal if you have lingering sensitivity to hot or cold, a deep cavity, a cracked tooth, swelling near the gum, or a tooth that's darkened. But you can't diagnose this yourself, and you shouldn't try. An X-ray tells the real story. The honest takeaway from all 7 myths is the same: a root canal isn't the thing to fear. The untreated infection is. If a tooth's been bothering you, get it looked at before it turns into an emergency. Our root canal treatment page explains what to expect from start to finish.
Frequently Asked Questions
Does a root canal really not hurt?
With modern anaesthesia, the procedure itself feels similar to having a filling done. The intense pain people associate with root canals is actually the infection beforehand, which the treatment relieves. Most patients tell us afterwards that it was far easier than they'd built it up to be.
Is it cheaper to just remove the tooth?
It's cheaper on the day, but not over time. Once a tooth is gone, the gap leads to shifting teeth and bone loss, and replacing it with an implant or bridge costs more than the root canal would have. Saving the natural tooth is usually the smarter financial choice as well as the healthier one.
Do I really need a crown after a root canal?
For back teeth, yes, in most cases. A root-canalled tooth becomes brittle and can crack under chewing pressure, so the crown protects it. Skipping the crown is one of the most common reasons these teeth fail later, so it's part of the treatment, not an optional extra.
Can a root canal be done in one visit?
Often, yes. With rotary instruments, many straightforward cases are completed in a single sitting. Teeth with active infection or complex anatomy may need a second visit, but the long string of appointments people remember is largely a thing of the past.