Pain after a filling or dental treatment: normal or not?

Is a sensitive tooth after a filling normal? The short answer

Often, yes: brief sensitivity to cold that eases day by day is a usual reaction after treating decay, especially if the cavity was deep. It generally fades within a few days to a few weeks. By contrast, pain when biting often points to a filling that is slightly too high, which is easy to fix, while spontaneous, throbbing pain or pain that wakes you at night suggests inflammation of the nerve that needs to be reassessed promptly.

So the key is less the intensity than the type of pain and how it changes: discomfort that is easing is reassuring; discomfort that is growing or changing in character is not.

This article focuses on pain following recent treatment. For long-standing sensitivity linked to exposed roots or wear, our article on tooth sensitivity is more relevant; for toothache without recent treatment, see toothache: what to do.

Why a tooth reacts after treatment

Treating decay is not trivial for the tooth, even when everything goes well. Several mechanisms explain why you may feel it in the days that follow:

• Closeness to the nerve. The deeper the decay, the thinner the layer of dentine left between the filling and the pulp. The pulp, already irritated by the decay, is irritated a little more by drilling and drying.
• The dentine itself. It is crossed by tiny fluid-filled channels linked to the nerve. Until these channels are fully sealed, temperature changes are passed on more easily.
• The material. Composites shrink slightly as they harden; if the bond is not perfect at one point, a small stress or micro-leakage can keep sensitivity going, especially when chewing.
• The bite. A filling that stands proud by a fraction of a millimetre takes the full force of chewing, which irritates the ligament around the root.
• The surrounding tissues. The injection site, or gum pinched by the matrix band or a wooden wedge, can stay tender for a few days.

Most of these causes are harmless and temporary, but some need a simple adjustment, which is why describing what you feel accurately is so useful.

Recognising the type of pain

Your description guides the dentist directly. Here are the most common situations and what they usually suggest:

• A small twinge with cold that goes in seconds and eases every day: a normal pulp reaction, which settles by itself in most cases.
• Pain when clenching or chewing, as if the tooth hits first: a high filling. Adjusting it takes a few minutes and often brings immediate relief.
• Sharp pain at the moment you release your bite: a possible crack in the tooth, sometimes present before the treatment. It needs a careful examination.
• Pain with cold or heat that lingers long after the stimulus, or spontaneous, pulsing pain that wakes you at night: a likely sign of pulpitis (inflammation of the nerve) that is not resolving.
• Dull pain on pressure, the tooth feels longer, sometimes with swelling: inflammation around the root, or even infection.
• A tiny electric shock when a fork touches an old metal filling: a so-called galvanic effect, usually temporary.
• Pain between two teeth, food getting stuck: not enough contact between the new filling and the neighbouring tooth.
• Sore gum next to the tooth: irritation from the treatment, which usually settles within a few days.

How long normal sensitivity can last

There is no timescale that applies to everyone, but a few landmarks help you judge where you stand.

After a small, shallow filling, any discomfort often disappears within a few days. After deep decay, sensitivity to cold can persist for several weeks while gradually fading: that is the time the pulp needs to settle and sometimes to lay down a thin protective layer of dentine.

What matters is the trend:

• sensitivity that is easing, even slowly, is generally a good sign;
• sensitivity that is unchanged after a few weeks deserves a check;
• sensitivity that is increasing, or turning into spontaneous pain, means calling the practice without waiting.

Pain on chewing caused by a high filling, however, does not always improve with time: the tooth stays overloaded until the bite is adjusted. There is no point in waiting weeks in that case.

Finally, a tooth treated without any trouble can stay silent for months and then become painful: a pulp badly affected by the original decay may slowly progress towards necrosis. This is not necessarily due to a mistake during treatment.

What to do in the meantime: relieve without masking

For moderate sensitivity that is easing, a few simple measures are often enough:

• Avoid extreme temperatures for a few days: iced drinks, ice cream, very hot tea.
• Chew on the other side if the tooth is sensitive to pressure, until your check-up.
• Use a toothpaste for sensitive teeth, applied gently to the tooth, with a soft brush.
• Keep cleaning the area, including with floss or interdental brushes: poor hygiene irritates the gum and prolongs the discomfort.
• An ordinary painkiller can be taken if the pain bothers you, following the leaflet and your own contraindications; ask your doctor or pharmacist if in doubt.

What is best avoided:

• taking antibiotics on your own initiative: they do not cure pulpitis and are only useful in specific situations;
• increasing painkiller doses to cope with worsening pain: it delays the diagnosis;
• putting aspirin or irritating products directly on the gum, which can burn it.

If the pain means you are taking painkillers regularly, that in itself is a reason to go back.

What the dentist does when you go back

A review appointment after a painful filling is usually quick, and it often solves the problem the same day.

The dentist:

• checks your bite with articulating paper: if the filling has a high spot, it is adjusted and re-polished;
• tests the tooth's response to cold and tapping, comparing it with the neighbouring teeth;
• checks the contacts with the tooth next door and the state of the gum;
• takes an X-ray if needed, to check how the filling fits and the area around the root;
• looks for a crack, for example by having you bite on a special instrument.

Depending on the findings, several next steps are possible: a simple adjustment, renewed protection of the pulp with a soothing material and a new filling, or, if the nerve is irreversibly inflamed, a root canal treatment to relieve the tooth lastingly while keeping it. A crack may lead to protecting the tooth with an onlay or a crown.

In the vast majority of cases, the cavity treatment was carried out correctly: the pain mainly reflects the state of the tooth before treatment. Telling your dentist about it is not a complaint, it is useful information.

When to call the practice in Rabat

It is best to contact your dentist promptly in the following situations:

• spontaneous, throbbing pain or pain that wakes you at night;
• sensitivity that is increasing instead of easing;
• clear pain on chewing that does not settle after a few days;
• swelling of the gum or cheek, a bad taste, fever;
• a filling that feels broken or rough, or lets food through;
• persistent pain beyond a few weeks, even if moderate.

Facial swelling, or difficulty swallowing or opening your mouth, calls for an urgent consultation.

If your treatment was done at German Dental Clinic in Agdal, feel free to call the practice or send a message describing your symptoms: the dentist will tell you whether you need to come back soon. If your treatment was done elsewhere and you live in Rabat, you can also book an appointment to have the tooth checked.