Getting a cavity filled is one of the most routine things we do, so it can be a surprise when your jaw feels tender for a day or two afterwards. The good news is that a bit of soreness is normal, it is usually mild, and it settles on its own within a few days for most people.
Still, it helps to know what is causing that ache, how long to expect it, and the point where a quick check is worth booking. Here is what we tell our patients in Mosman.
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Why your jaw feels sore after a filling
Most jaw soreness after a filling has nothing to do with the filling failing. It comes from the appointment itself and the small demands it places on your jaw. The usual causes are:
- Holding your mouth open. Even a short appointment asks your jaw muscles to stay open and still, and back teeth need a wider stretch. Those muscles can feel tired and achy afterwards, a bit like any muscle you have held in one position too long.
- The anaesthetic injection. The spot where the local anaesthetic went in can stay tender for a day or so as it wears off.
- A filling that sits slightly high. New filling material occasionally sits a fraction too tall, so you hit it first when you bite. Your jaw then works harder on that side, which strains the muscles and the joint.
- A deeper filling near the nerve. If the cavity was close to the nerve, the tooth can feel sensitive while it settles, and that can read as a dull ache around the jaw.
- Existing clenching or grinding. If you already tense or grind your jaw, keeping it open for treatment can flare that tension.
In our experience, the ache people describe after a back-tooth filling is far more often tired muscles than a sign that anything is wrong with the tooth.
How long jaw soreness usually lasts
For most people, muscle soreness eases over the first two to three days and fades a little more each day. Tenderness at the injection site tends to clear within a day or two.
The one type that will not settle on its own is soreness from a bite that sits too high, because the tooth keeps taking the extra load every time you eat. If that is the cause, a small adjustment fixes it quickly. The simplest signal to watch is direction: soreness that is slowly improving is usually just healing, while soreness that is getting worse deserves a closer look.
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Simple ways to ease it at home
While your jaw settles, a few small changes make a real difference:
- Stick to softer foods for a day or two and chew on the opposite side.
- Hold a warm compress against the sore jaw muscles to help them relax.
- Give your jaw a rest by avoiding chewing gum and wide yawns.
- Take a simple over-the-counter pain reliever if it suits you and you have no reason to avoid it.
If the ache seems to sit in the tooth rather than the muscles, our guide on relieving tooth pain after a filling walks through what tends to help and what to avoid. Gentle care and a little patience are usually all your jaw needs in the first few days.
When to have your dentist take a look
Book a check sooner rather than later if you notice any of the following:
- Sharp pain when you bite down, which often points to a filling that needs a quick adjustment.
- Soreness that is getting worse after three or four days instead of easing.
- Pain that lingers beyond about a week.
- Throbbing, swelling, or pain that wakes you at night.
- Your jaw starts to click, catch, or lock when you open wide.
None of these mean something has gone badly wrong, but they are worth checking. Adjusting a high filling usually takes only a couple of minutes, and it is far better to have it sorted than to keep chewing around it. If your tooth is sensitive rather than just sore, we can look at why and put your mind at ease.
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Come and see us in Mosman
A little jaw soreness after a filling is part of normal healing for most people, and it rarely lasts long. If yours is not settling, or you are simply not sure whether what you are feeling is normal, we would rather you ask than sit with it.Get in touch with our Mosman Dentist team and we will help you work out what is going on and sort it out.
