Root canals carry a reputation they no longer deserve. Here's the truth we see every week: the terrible pain people associate with a root canal is the infection before treatment — the treatment is what makes it stop. A modern root canal feels a lot like getting a filling, and most people are surprised by how uneventful the recovery is. Here's exactly what to expect afterward, what's normal, what isn't, and how to make the result last.
A ten-second refresher on what just happened
A root canal removes the inflamed or infected tissue from inside the tooth, cleans and disinfects the canals, and seals them. The tooth stays; the toothache's engine is gone. What's left is a tooth that needs a little time to settle and, usually, a proper final restoration to protect it.
The first few hours
You'll be numb for a few hours — don't chew anything until feeling fully returns, or your cheek and tongue will pay for it. If we recommended pain relief, take the first dose before the numbness wears off; staying ahead of soreness beats chasing it. An ordinary evening at home is the right speed for the rest of the day.
What normal soreness looks like
For a few days, expect the tooth and the surrounding gum to feel tender, especially when you bite — the tissues around the root are settling down after both the infection and the work. An over-the-counter pain reliever you normally take usually handles it comfortably, and each day should be a little better than the one before. Mild jaw stiffness from holding open is normal too. Tenderness gradually fading over several days to a week or so is the healthy pattern.
What to eat
Soft and unremarkable is the theme: eggs, pasta, yogurt, soups, tender fish, mashed anything. Chew on the other side until your permanent restoration is in place — and this matters more than it sounds, because a root-canal-treated tooth (often wearing only a temporary filling) is more brittle than it looks. Avoid hard, crunchy, and sticky foods on that side: no ice-chewing, no caramel, no popcorn kernels, no using the tooth as a bottle opener (people do; teeth lose).
Pain that is NOT normal — call us
- Severe pain or visible swelling that's getting worse a few days out instead of better.
- Fever, or swelling spreading into the face or neck.
- Pressure pain that won't ease — sometimes the bite is simply sitting a hair high after treatment, which is a quick, easy adjustment, not a failure. Don't grit your way through it; come let us tap it into place.
- A toothache that returns weeks or months later in the treated tooth. Occasionally a canal needs another round of attention — uncommon, but real, and much easier to address early.
None of these mean disaster. All of them mean pick up the phone. (And for the miserable middle-of-the-night version, our nighttime toothache guide has you covered until we open.)
The step people skip — and really shouldn't
Most back teeth need a crown after a root canal, and this is the part of the story where long-term success is decided. The treated tooth no longer has its inner blood supply, which leaves it drier and more brittle — and a molar takes a beating with every meal. A crown caps and protects it so it doesn't crack. We see the sad version of this regularly: a successful root canal, a crown that kept getting postponed, and then a fracture that no longer can be fixed. If we've recommended a crown, treat the temporary phase as a bridge, not a destination — here's our complete guide to crowns, including what the visit is like.
How long does a root canal last?
Here's the honest answer: with a prompt, well-fitted final restoration and ordinary good care, a root-canal-treated tooth can serve you for many, many years — often for the rest of your life, right alongside your natural teeth. The biggest factors are within your control: getting the permanent crown or filling placed promptly, brushing and flossing like the tooth is precious (it is), wearing a night guard if you grind, and keeping your regular checkups so we can watch it with X-rays over time.
Keeping the rest of your mouth off this page
The best root canal is the one you never need. The usual road to one runs through deep decay or a crack that reached the nerve — which means regular checkups, catching small cavities while they're small, and taking a cracked tooth seriously are your best prevention.
Questions about a tooth that's been treated — or one that's aching?
Whether you're recovering and something feels off, or you've been told you need a root canal and want it handled gently, we're here. Call our Keene office or our Joshua office — comfort-first care, plain-English answers, no lectures.