This article is general information for our patients, not a diagnosis. If something in your mouth hurts, changes, or worries you, have it examined.
Drafted with AI assistance and reviewed for accuracy by Dr. Nick Jadidi.
Almost every toothache is the same message in a different accent: the nerve inside a tooth is in trouble. What changes, and what eventually decides whether a tooth needs a filling, a root canal, or to come out, is how the pain behaves. Below I’ll walk through how I read those patterns, with one caution up front: identical symptoms can come from different problems, so let the pattern guide how urgently you act, not what you conclude.
What is my toothache trying to tell me?
Most toothaches trace back to the nerve inside the tooth reacting to trouble, and each pain pattern (a quick twinge, a lingering ache, a night-time throb) points toward a different stage of that trouble. Inside every tooth is a soft core of nerves and blood vessels (the pulp), sealed in a hard chamber. When decay, a crack or an old deep filling lets bacteria reach it, the nerve inflames; trapped with nowhere to swell, even a little inflammation hurts out of proportion to the size of the hole. These are the patterns I weigh:
| What you notice | What it can point toward |
|---|---|
| Quick twinge to cold or sweet, gone in seconds | Often simple sensitivity — usually mild |
| An ache that lingers past about 30 seconds after hot or cold | A nerve that may be inflamed beyond healing |
| Throbbing that starts on its own, worse at night | A dying nerve or early infection |
| A sharp jolt when you bite one spot | A possible crack or a filling sitting high |
| Tender to press, feels slightly “tall” | Inflammation that may have reached the bone |
| A gum pimple that comes and goes painlessly | A long-standing infection quietly draining |
| Facial swelling or fever | A spreading infection — treat as urgent |
The first thing I weigh is how long the pain outlasts its trigger, and even that can fool you: two people both describing “pain with cold” can have completely different problems (more on that below). How a toothache behaves is a clue, never the verdict. What actually pins the cause down is whether the pulp inside is alive or dying: how the tooth answers a cold or electric vitality test, whether it flinches to a tap, and what an X-ray shows at the root, all set against what you’ve told me. So use these patterns to understand your pain and judge how urgent it is, not to reach a conclusion on your own.
When does tooth sensitivity turn into something worse?
Sensitivity crosses into something worse when the quick twinge stops fading and starts to linger after the cold or sweet is gone: that shift usually means the problem has moved deeper than a toothpaste can reach. A brief twinge that vanishes almost as soon as the trigger does is usually sensitivity, the least worrying pain here. It comes from the softer layer under the enamel (the dentine) being exposed, and it often settles once the cause is treated. Pain that fades within a second or two is usually simple sensitivity; pain that lingers past about 30 seconds points toward a nerve inflamed beyond healing.
How do I know if a tooth nerve is dying?
When an ache hangs on for more than about 30 seconds after the trigger, or starts up with no trigger at all, the nerve may be inflamed past the point of recovery (irreversible pulpitis). It’s often hard to pin down: you might know it’s “somewhere on the lower left” but not which tooth, because neighbouring teeth share nerve pathways. If that’s where things are, the options usually narrow to a root canal to remove the infected nerve, or removing the tooth, but which one, and whether the nerve really is beyond saving, isn’t something I’d settle from symptoms alone.
Why does cold water help my toothache?
Cold water easing a toothache is often a warning, not a comfort: the same cold that gives a healthy nerve a one-second twinge can briefly relieve a nerve that is dying. A tooth that feels better with an ice-cold sip may actually be in more trouble, not less; it sounds backwards, but it’s a pattern I take seriously. Some people find themselves sipping ice water just to get through the evening, and that habit alone tells me a lot. If cold calms the ache instead of triggering it, the nerve may be past the point of settling on its own, so mention it when you call — it’s exactly the kind of detail that helps us test the right tooth.
My toothache stopped suddenly — is that bad?
It can be a bad sign: a tooth that throbs for days and then goes quiet often hasn’t healed; the nerve may have died while the infection carries on with less to warn you. A sudden easing can be the least reassuring sign of all. If a bad toothache disappears on its own, I’d still want to look.
Why does my tooth throb worse at night?
Throbbing is your own pulse pushing against inflamed tissue with nowhere to expand: lying down sends more blood to your head and raises the pressure inside the tooth, which is why the ache turns worse at night. The pain that was bearable by day can keep you up at 2 a.m., and extra pillows help only a little; a tooth throbbing on its own rarely settles for good by itself.
What the severity of the pain tells you
People often want a number for their toothache, where it sits on a pain scale, and I understand why, but the character of the pain tells me more than the score does. A sharp, short twinge and a deep, constant throb can register as the “same” seven out of ten while pointing at very different problems. So I listen less for how loud the pain is and more for how it behaves.
A few things about severity that genuinely work as clues, none of them a verdict on its own:
- Pain that keeps you from sleeping, eating, or concentrating tends to point toward a nerve that’s inflamed beyond healing, or an infection building, not simple sensitivity.
- Pain that arrives on its own, with nothing setting it off, generally sits further along than pain that only shows up with cold or sweet.
- Pain that ordinary painkillers barely touch, or that needs them around the clock, is itself a reason to be seen; that’s often the pattern of a dying nerve or an abscess.
- A sudden spike into severe, hard-to-place throbbing, sometimes with a tooth that feels “tall” or tender to touch, can mean an infection has reached the bone.
One caution that cuts against the number entirely: pain that suddenly drops isn’t automatically good news. As the section above notes, a nerve can quiet down because it has died, not healed. And how much a tooth hurts doesn’t reliably track how serious it is: a quietly draining abscess can be nearly painless while a shallow crack can be agony. So use severity to judge how soon to call, not to grade the problem. If the pain is stopping you sleeping or eating, that alone is worth a call to 705-721-9229; a real read of what’s happening still needs an exam and an X-ray together.
What decides the treatment
Whether a tooth needs a filling, a root canal, draining, or removal comes down to things your symptoms can’t tell you on their own. The deciders are how the tooth responds to a cold test, whether it’s tender to a specific tap, and what an X-ray shows at the root tip and in the bone around it. Any one of those, by itself, can mislead; set beside what you’ve told me, they usually agree on a single culprit, and that weighing-up is what the appointment is for.
What are the stages of a tooth abscess?
A tooth abscess tends to build in stages: deep decay, a dying nerve (pain often fades here), tenderness to bite as infection reaches the bone, then pus at the root tip that either drains through the gum or spreads into the face. If a nerve dies untreated, bacteria collect at the root tip and the body walls off the infection as pus; the version that spreads into the face and neck is the dangerous one. A painless gum pimple (a sinus tract) isn’t “gone”; it’s an infection quietly draining through a channel in the bone. A tooth slowly turning grey usually means the nerve has died and its dark pigments have soaked into the tooth. None of these hurt much, which is exactly why they get missed.
How can I ease a toothache until I’m seen?
Painkillers off the pharmacy shelf can dull a toothache for a while, but they only muffle the signal; the tooth itself is left untouched. If you find you’re reaching for them every few hours just to cope, that reliance is its own reason to come in. Because dental pain is largely an inflammation problem, an anti-inflammatory type often helps most; but which one is right for you, and how much, is a question for your pharmacist — it matters if you take other medicines or have a health condition. Two things to avoid: don’t rest an aspirin against the gum (it burns the tissue and does nothing for the tooth), and don’t lean on a leftover course of antibiotics. A dead tooth has no blood supply and abscess pus is walled off, so antibiotics can’t reach the source, and any relief is temporary.
When is a toothache a dental emergency?
A toothache becomes an emergency when the infection behind it starts to spread beyond the tooth, because swelling that tracks toward the throat can threaten the airway. Go straight to a hospital or call 911 for swelling in the floor of the mouth or under the jaw on both sides, a raised tongue or muffled voice, trouble swallowing your own saliva, or any difficulty breathing, or for swelling spreading toward your eye or neck. What marks the dangerous kind is speed: swelling that spreads over hours rather than days, especially under the jaw or across the floor of the mouth, belongs in a hospital that evening, not on a wait-and-see list.
Short of those, severe constant pain, a fever with face swelling, or a broken tooth are reasons to call us promptly at 705-721-9229. A knocked-out adult tooth is even more time-critical; what to do for a knocked-out tooth covers the first hour, which often decides whether it can be saved. If you’re unsure, read more about the warning signs that a dental problem is an emergency, or just phone and describe it — I’d far rather hear from you early.
If you’re weighing where to go tonight, this is the short version:
| What’s happening | Where to go | How soon |
|---|---|---|
| Throbbing that keeps you up, painkillers barely touching it | Call us at 705-721-9229 or book an emergency examination online | Promptly |
| A gum pimple that keeps returning, or a tooth slowly darkening | Book an exam | Soon; it won’t clear on its own |
| Swelling spreading over hours, trouble swallowing or breathing | Hospital emergency department or 911 | Now |
What will the dentist do for my toothache?
Diagnosis comes first: we press and tap along the row to find the sore tooth, apply cold to tell which nerves are still alive, and take an X-ray, then weigh those findings against one another. It’s the one step no amount of guessing at home can replace; those few minutes usually pinpoint what the symptoms couldn’t. Then comfort: a local anaesthetic (freezing), and draining any abscess that’s come to a head. Only then do we treat the cause, usually a root canal for a tooth worth keeping (here’s how a root canal saves an infected tooth), or removing one too far gone. We also keep room for emergency dental care here in Barrie, so people in real pain aren’t left waiting.
If you have a toothache that won’t settle, a gum pimple that keeps returning, a darkening tooth, or any swelling, our team at Prince William Way Dental in Barrie will find the cause and help you decide what to do next. Call 705-721-9229 or visit our contact page. Emergency examinations can also be booked online.
