Symptoms, explained
Sensitive teeth: why the zing happens — and how we calm it
That wince with ice water, cold air, or the first bite of ice cream — sensitive teeth are one of the most common problems we see, and one of the most fixable. Here’s what’s usually behind the zing, and how we calm it, starting with the gentlest option.
This page can’t diagnose you. Simple sensitivity and early decay can cause exactly the same zing. The tests in the chair — a cold test, a gentle tap, an X-ray — make the call. You’re not expected to know what’s causing it. That’s our job. This page just helps you understand what you’re feeling and what to expect.
The good news up front: most sensitivity is calmed with simple, gentle steps — often starting with nothing more than the right toothpaste and a softer brush.
Toothache right now? We keep same-day slots — and we answer.
Call nowTeeth that look longer, notches at the gumline, a zing with cold air
If cold air, cold drinks or even a fingernail near the gumline makes a tooth zing, you’re not imagining it — and you’re not alone.
Here’s what’s usually happening. The top part of a tooth is covered in enamel, which doesn’t feel anything. The root isn’t — it’s meant to be covered by gum. When the gum pulls back, part of the root is left bare. Root surfaces are full of tiny channels that lead straight to the nerve, so cold, touch and sweet things suddenly have a direct line in. That’s the zing.
The usual culprits: years of brushing a bit too hard with a firm brush, and acid — from fizzy drinks, citrus, or stomach acid if you often get reflux or heartburn. Small worn notches at the gumline and teeth that look slightly longer are part of the same picture. None of it means you’ve done something terribly wrong — it builds up slowly, and it’s very common.
What you should do
Book a routine appointment so we can confirm it’s simple sensitivity and not something hiding underneath. In the meantime, switch to a soft toothbrush and gentle circles — scrubbing harder makes this worse, not better.
How we calm it — gentlest first
Once we’ve confirmed it’s sensitivity, we work up a short ladder, starting with the gentlest step and stopping as soon as the problem is solved:
- Remove what’s causing it. A softer brush and a gentler technique, fewer acid hits on your teeth through the day, and sorting out reflux if you have it. If you’ve been whitening your teeth, pausing for a while usually settles that kind of sensitivity.
- Desensitise. Toothpastes for sensitive teeth genuinely help — one type calms the nerve, another blocks those tiny channels. They work gradually rather than instantly, so give them a couple of weeks. If they’re not enough, we can paint on a fluoride varnish or a protective coating in the chair — a quick, gentle visit.
- Fill the notch. If a gumline notch has become deep, a small tooth-coloured filling covers the exposed surface and protects it.
- Cover the root. For gums that keep receding, a small gum graft — surgery that covers the bare root with a little of your own gum tissue — can rebuild the cover. That’s the far end of the ladder; most people never need it.
Sometimes the right plan is simply to watch: photos at your check-ups tell us whether the gum is stable or still slowly moving.
What you should do
Book a routine appointment. You don’t need to arrive with the answer — describing when it zings is enough for us to start.
When a “zing” is really early decay
Here’s the catch, and the reason we check before we treat: early decay and a leaking old filling can cause exactly the same zing — short, sharp, gone in a second. So can the early stage of a cracked tooth. From the outside, they can feel identical to simple sensitivity.
Telling them apart is quick — that’s what the X-ray and a close look at your fillings are for. And caught at this stage, it’s the cheap, easy end of dentistry:
- If it’s decay, or an old filling that’s worn or leaking: a normal filling fixes it.
- If the decay is deep, we place a protective dressing over the living part of the tooth so it can recover — dentists call this a pulp cap. The whole point is to avoid a root canal.
What you should do
Book in the next week or two rather than waiting for your next check-up. A zing that’s decay only gets bigger — and the early fix is the small one.
If the zing starts to linger — that’s a different problem
One warning sign to take seriously. Sensitivity zings and then stops the moment the cold is gone. If the ache starts hanging around for minutes, throbbing on its own, or waking you at night, that’s not sensitivity any more — the nerve inside the tooth is inflamed past the point of settling by itself, and it needs treatment, not a stronger toothpaste.
If that’s where you are, you’re probably tired and sore and wondering how long you can push through. You don’t have to. We can normally relieve this pain quickly — usually the same day.
What you should do
Contact us today — this is what our same-day emergency slots are for. Don’t wait it out with painkillers; this kind of pain doesn’t fix itself.
Go to an emergency department NOW — don’t wait for us — if you have: swelling under the tongue or into the neck, difficulty swallowing or breathing, an eye swelling shut, or rapidly spreading facial swelling with fever. These are medical emergencies first and dental problems second.
What it costs
Every price above is a genuine “starting from” for the straightforward case. We quote before we treat — always. If you’re on a medical aid, we claim directly: you pay only co-payments and anything your plan doesn’t cover or has already used up.
On a medical aid? See what your scheme’s published benefits say — and we confirm with a benefit check before treatment.
Not sure which pattern is yours?
Tell us what you’re feeling — we’ll take it from there.