The hour after a filling is the one nobody explains. Your lip is numb, the tooth feels strange, and you have no idea which of those is supposed to happen. Most of it settles. One thing does not, and it is the one people put up with longest — usually because saying it in Korean feels harder than living with it.
Dental work changes the shape of a tooth, and your mouth notices shapes to a fraction of a millimetre. A few days of strangeness is ordinary. Knowing which strangeness to ignore and which to report is the useful part.
The one not to put up with
If your bite feels high — as if that one tooth touches before the others — go back and have it adjusted.
This is not fussiness and it is not a complaint about the work. A new filling or crown is shaped by eye and by feel while your mouth is numb, so a small excess is a normal part of the process, not a mistake. It is corrected by taking a sliver off the surface, which usually takes a few minutes and needs no anaesthetic.
Left alone it does not settle. The tooth takes every chewing force first, all day, and that produces exactly the symptoms people then blame on the treatment — aching, sensitivity, a tooth that feels bruised. Occasionally it does real damage.
The reason this matters more for foreign residents is simple: it is an awkward thing to raise in a second language, so people wait, and by the time they mention it they have had weeks of discomfort that a short appointment would have ended.
The first hour, while you are numb
Do not test the tooth by chewing on it, and be careful with anything hot. A numb lip or cheek is easy to bite without noticing, and that injury hurts far longer than the dental work does. With children this is worth watching closely.
You cannot judge your bite properly while numb. If it feels odd an hour later, that is the moment to pay attention.
What settles on its own
| What you notice | What is usually behind it |
|---|---|
| Cold sensitivity on the treated tooth | The tooth reacting to having been worked on. Usually fades over days to a few weeks |
| Tenderness when you bite for a day or two | Normal inflammation around the tooth, especially after a deep filling |
| Sore or slightly bleeding gum next to the work | The gum was retracted or irritated during treatment |
| A rough edge you keep finding with your tongue | Often just a new contour your tongue has not accepted yet — though worth mentioning if it catches floss |
| A tooth that feels unfamiliar rather than wrong | Your bite re-learning the shape |
A useful rule: things that are improving, even slowly, are usually on the right path. Things that are the same or worse after a week or two are worth a call.
What does not settle
These are worth raising rather than waiting out:
- A high bite, as above — the single most common and most fixable.
- Sharp pain on biting rather than general tenderness, which can point to a crack or to the restoration itself.
- Lingering pain after something cold — a few seconds is ordinary, half a minute is not.
- Pain that starts spontaneously, wakes you at night, or needs painkillers to sleep.
- Swelling of the gum or face, or a bad taste that keeps returning.
- Floss that shreds or catches on the new work every time.
- A temporary crown that comes loose. Temporaries are meant to come off eventually, but not now.
None of these means something went wrong. They mean something needs looking at, which is a different sentence.
Going back is not a complaint
This is worth saying plainly, because it is where the hesitation lives. Adjusting a bite, smoothing a contour and checking a restoration that is still settling are part of the treatment, not a dispute about it. Clinics expect it. The appointment is usually short.
If you are unsure whether what you are feeling warrants a visit, describe it on the phone or in a message first and let the clinic decide. That costs nothing and it is what the receptionist is there for.
Five phrases that cover it
Short enough to show on a screen at the desk or in the chair.
| Korean | What it says |
|---|---|
| 물면 높아요 | It feels high when I bite |
| 씹을 때 아파요 | It hurts when I chew |
| 찬물에 시려요 | It's sensitive to cold water |
| 조정해 주실 수 있나요? | Could you adjust it? |
| 치실이 걸려요 | The floss catches |
There is a fuller set in Korean phrases for the dentist.
The short version
Expect a few days of strangeness and give cold sensitivity time. Do not give a high bite time — that one is corrected in minutes and causes real trouble if you wait. Anything getting worse after a week, or waking you at night, is worth a call rather than a wait.
At Seoul Lab Dental: we will tell you before you leave what to expect and roughly how long it should last, and adjusting a new filling or crown is a normal follow-up rather than something to feel awkward about. Message us in English with what you are feeling and we will tell you whether it needs an appointment.
Frequently asked questions
My new filling feels too high when I bite. Is that normal?
A small excess is a normal part of the process — the tooth is shaped while your mouth is numb, so it is checked again once feeling returns. What is not normal is leaving it. It does not settle, and the tooth takes every chewing force first, which produces the aching and sensitivity people then blame on the treatment. Go back and ask for it to be adjusted; it usually takes a few minutes and needs no anaesthetic.
How long should a tooth stay sensitive after a filling?
Cold sensitivity on a treated tooth is common and usually fades over days to a few weeks, especially after a deep filling. The useful test is direction rather than duration — something improving, even slowly, is usually on the right path. Sensitivity that is the same or worse after a week or two, pain that lingers for half a minute after something cold, or pain that starts on its own and wakes you at night all warrant a call.
Is it rude to go back to the dentist to have work adjusted?
No. Adjusting a bite, smoothing a contour and checking a restoration that is still settling are part of the treatment, not a dispute about it, and clinics expect it. The appointment is usually short. If you are unsure whether it warrants a visit, describe it by phone or message first and let the clinic decide.
What should I avoid right after a filling while I am still numb?
Avoid chewing on that side and be careful with anything hot. A numb lip or cheek is easy to bite without noticing, and that injury hurts far longer than the dental work does — worth watching closely with children. You also cannot judge your bite properly while numb, so wait until feeling returns before deciding whether it feels high.
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