Swelling after a filling is usually mild, limited to the gum right around the treated tooth, and settles within a day or two as the local anaesthetic wears off and the tissue recovers from the injection and the procedure itself. This kind of swelling typically peaks on the day of treatment and improves steadily from there. Swelling that spreads beyond the immediate area, gets worse after the second or third day, or comes with fever or a throbbing ache usually points to something else going on, such as an infection or a bite that's sitting too high, and is worth having checked.
Key takeaways
- Mild swelling or tenderness right around a filling for a day or two is a normal response to the injection and procedure.
- The rule of thumb: swelling that is steadily improving by day two or three is normal, swelling that is spreading or worsening is not.
- A filling that feels slightly different when you bite for the first day is common, especially while any numbness wears off.
- Spreading swelling, fever, a throbbing toothache or swelling that reaches your cheek, jaw or eye needs prompt attention.
- Sometimes worsening pain after a filling is caused by a "high" filling rather than infection, which is a simple, quick fix.
- Gentle oral hygiene and warm salt water rinses can support comfort while the area settles.
As a general rule: mild, localised swelling that improves day by day is a normal part of recovery. Swelling that spreads, or pain that gets worse after day two or three, is not normal and should be checked.
Why gums can swell after a filling
Getting a filling usually involves a local anaesthetic injection, removal of decayed tooth structure, and placement of the filling material. Each of these steps can cause some mild, temporary irritation to the surrounding gum and soft tissue. The injection site itself can feel tender or slightly puffy for a day or so, separate from the tooth that was actually filled. Deeper fillings, or those closer to the nerve, tend to cause a bit more post-treatment sensitivity and mild swelling than small, shallow fillings.
It's also common to feel some numbness in the lip, cheek or tongue for a few hours after treatment, particularly with fillings on the lower back teeth, which can make the area feel swollen even when it isn't.
What's normal in the first 24 to 48 hours
In the day or two after a filling, it's common to notice:
- Mild puffiness or tenderness in the gum next to the filled tooth
- Sensitivity to hot, cold or sweet food and drink
- A slightly odd feeling when biting down, especially while numbness wears off
- Mild tenderness at the injection site, which may be a different spot to the filled tooth
These symptoms typically ease noticeably by the second day and should be mostly gone within three to four days. If anything, they should be trending down each day rather than staying the same or increasing.
When swelling after a filling isn't normal
A small number of patients develop symptoms that go beyond typical post-filling discomfort. These are less common, but it's worth knowing what to watch for.
Signs that need a dental review
- Swelling that spreads to the cheek, jaw, under the eye or down the neck
- Swelling or pain that is worse on day two or three than it was on day one
- A throbbing toothache, particularly one that wakes you at night
- Fever, chills or feeling unwell
- A bad taste or discharge coming from around the tooth
- Difficulty opening your mouth fully or swallowing
Spreading swelling combined with fever can indicate a dental infection or abscess forming, which needs prompt treatment. Our article on the difference between a gum abscess and a tooth abscess is a useful read if you're trying to work out what you're dealing with. If symptoms are severe or rapidly worsening, treat it as a dental emergency. Our guide on what to do when you need an emergency dentist outlines the steps to take.
Could it just be a high filling?
One of the more common, and easily fixed, reasons for ongoing discomfort after a filling isn't infection at all, it's a bite that sits slightly too high. When a filling is a fraction too tall, your tooth takes more pressure than it should every time you bite, which can cause soreness, sensitivity and even swelling of the surrounding gum from the extra load. This tends to feel worse with chewing specifically, rather than a constant throb. It's a quick adjustment for a dentist to correct and is one of the most common reasons patients come back in the days after a filling.
General cost context for fillings
Filling costs in Australia vary depending on the material used, the size of the filling and how many surfaces of the tooth are involved. The table below gives a general market range as a guide only.
| Filling type | Typical general AU cost range | Notes |
|---|---|---|
| Small composite (tooth-coloured) filling | $150 to $300 | Single surface, common for small cavities |
| Larger composite filling | $250 to $450 | Multiple surfaces or larger decay |
| Amalgam filling | $120 to $250 | Less commonly used for visible teeth now |
| Filling replacement | $200 to $450 | Removing an old filling and replacing it |
For an accurate, personalised quote, it's best to have a dentist assess the tooth directly rather than relying on general ranges.
Looking after the area while it settles
- Avoid chewing on that side until any numbness has fully worn off, to avoid accidentally biting your cheek or tongue
- Stick to softer food for the first day if the area feels tender
- Rinse gently with warm salt water a few times a day. Our guide to salt water rinses and their benefits has simple instructions
- Continue brushing and flossing gently around the area rather than avoiding it
- Use over-the-counter pain relief as directed on the packaging if needed
If you've had a filling fall out entirely rather than just feeling swollen or sore, that's a different situation with its own first-aid steps. Our article on what to do after you've lost a filling walks through protecting the tooth until you can be seen.
Frequently asked questions
Is it normal for gums to swell after a filling?
Yes, mild, localised swelling right around a newly filled tooth is common for a day or two, particularly after deeper fillings or fillings that needed a local anaesthetic injection.
How long does swelling after a filling usually last?
Most swelling peaks on the day of the procedure and steadily improves from there, usually resolving within two to three days. It should never be getting worse after the second day.
Why does my tooth still hurt days after a filling?
This can be due to normal post-procedure sensitivity, which can last a week or two for deeper fillings, or it may point to a high bite or, less commonly, infection. If pain persists or worsens, it's worth a review.
Can a filling cause an infection?
It's uncommon, but if decay was close to the nerve, or if the tooth reacts poorly to the procedure, infection can occasionally develop. This usually presents as worsening pain, spreading swelling or fever rather than mild, stable tenderness.
Why does my bite feel different after a filling?
It's common for a new filling to feel slightly different for a day or so, especially while numbness wears off. If your bite still feels uneven or the tooth feels "too tall" after a day or two, a quick adjustment can usually fix it.
Should I go to an emergency dentist for swelling after a filling?
If swelling is spreading, you have a fever, or the pain is escalating rather than easing, it's best treated as urgent rather than waiting for a routine appointment.
Most swelling after a filling is a normal, short-lived part of healing, but it's always worth getting checked if things aren't improving. See our current offers or book with a general dentist in Melrose Park.
