Root canal treatment has a bad name in many families. Most of that reputation comes from stories, not from how the treatment is done today. Here are the beliefs people mention most often, and what published dental guidance says about each one.
What a root canal is, in one paragraph
Inside every tooth is the pulp, soft tissue with nerves and blood vessels. When decay, a crack or an injury lets bacteria reach the pulp, it becomes inflamed or infected. Root canal treatment removes the infected pulp, cleans and shapes the thin canals inside the roots, and fills and seals them so the tooth can stay in your mouth. The root canal treatment page explains each step.
Myth: “Root canal treatment is very painful”
Fact: the treatment is done with a local anaesthetic. The NHS describes it as being done while you are awake but numb, so you should not feel pain during it. Most people feel pressure and vibration. It is the infection before treatment that usually causes the severe pain people remember.
After treatment, the area can feel sore or a little swollen for a few days, sometimes up to a couple of weeks. Ordinary painkillers, taken as the dentist advises, usually help. If you feel pain during treatment, say so: more anaesthetic can be given.
Myth: “It is better to just pull the tooth out”
Fact: keeping your own tooth is usually preferred when it can be saved. Removing a tooth leaves a gap. Neighbouring teeth can tilt into it and the opposite tooth can drift, and replacing the tooth later with a bridge, denture or implant means more treatment and more cost.
Sometimes a tooth really cannot be saved, for example when it is split or too little of it is left. Your dentist will explain the options for your tooth, with the fee for each.
Myth: “If the pain has stopped, the problem has gone”
Fact: pain can stop because the nerve inside the tooth has died, while the infection carries on. The NHS notes that a dental abscess will not go away on its own. An infected tooth that no longer hurts still needs a dentist to look at it, usually with an X-ray.
Myth: “Antibiotics can cure the tooth instead”
Fact: antibiotics do not clean out the inside of a tooth. A dentist may prescribe them in some cases, for example when infection is spreading, but the tooth itself still needs treatment: root canal treatment or removal. Do not take leftover antibiotics or buy them without a prescription.
Myth: “Root canal treatment makes you ill”
Fact: this idea comes from a theory that was tested and discarded long ago. Endodontic organisations such as the American Association of Endodontists state that there is no valid scientific evidence linking root-canal-treated teeth to disease elsewhere in the body.
Myth: “A root-treated tooth never needs anything else”
Fact: a back tooth that needed root canal treatment has often lost a lot of structure to decay, and it can crack when you chew. That is why a crown (cap) is often advised afterwards. A root-treated tooth can also decay again at its edges, so brushing, cleaning between the teeth and check-ups still matter.
Myth: “It always takes many visits”
Fact: it depends on the tooth and the infection. Some teeth are treated in one visit; the NHS says it usually takes two or more appointments. A temporary filling protects the tooth between visits. Ask the dentist how many visits your tooth needs and what the fee includes.
When to see a dentist
See a dentist if a tooth hurts for more than two days, hurts when you bite, wakes you at night, or if your gum or face is swollen. If swelling spreads to the eye or neck, or makes it hard to breathe or swallow, go to a hospital emergency department straight away. The dental pain page has the full list.
This article is general information, not a diagnosis. A dentist needs to examine you to advise on your own teeth.