If you've lost a filling, the first thing to do is protect the exposed tooth by keeping it clean, avoiding chewing on that side, and using an over-the-counter temporary dental cement from a pharmacy if the area feels sharp or sensitive, then arranging to see a dentist as soon as reasonably possible. A tooth without its filling is more vulnerable to further damage, sensitivity and bacteria getting into the space underneath, but in most cases it is not an emergency that requires an after-hours dentist, provided you're not in severe pain.
Key takeaways
- Keep the area clean and avoid chewing on that side of your mouth until you're seen.
- Temporary dental cement or dental wax from a pharmacy can protect the tooth and ease sensitivity in the meantime.
- Avoid very hot, cold or sugary food and drink, as the exposed area is often more sensitive.
- Save the filling piece if you find it, though it usually can't be reused.
- Mild sensitivity is common and not usually urgent, but severe pain, swelling or a broken tooth underneath needs prompt attention.
- Book a routine appointment as soon as you can, since an exposed tooth is more prone to decay and further breakage the longer it's left.
As a general rule of thumb: if the tooth is just sensitive or feels rough, it can usually wait for a routine appointment within a few days. If there's significant pain, a sharp broken edge, or the tooth feels loose, treat it as urgent.
Why fillings come out
Fillings can dislodge for a number of reasons, including new decay forming underneath or around the edges of the filling, general wear and tear over the years, biting on something hard, or the bonding simply reaching the end of its lifespan. Older fillings, particularly larger ones, are more prone to coming loose than small, recent ones. It's a common enough issue that most general dentists see it regularly, so there's no need to panic if it happens to you.
Immediate steps to take at home
1. Clean the area gently
Rinse your mouth with warm water to clear away any food debris and get a clear look at the tooth. Avoid poking around with sharp objects, which can cause further damage or push debris into the space.
2. Protect the tooth
If the area feels sharp, rough or sensitive to your tongue or cheek, a pharmacy-bought temporary dental filling material or dental wax can be used to cover the exposed surface. These products are designed to be a short-term measure only, not a permanent fix, and are widely available over the counter.
3. Avoid chewing on that side
Try to eat on the opposite side of your mouth until you're seen. This reduces the risk of the tooth cracking further or food packing into the gap, which can be uncomfortable and increase the risk of decay.
4. Manage sensitivity
Avoid very hot, cold, sweet or acidic food and drink, all of which are more likely to trigger discomfort when dentine is exposed. Over-the-counter pain relief can be used as directed if needed.
5. Keep up your oral hygiene
Continue brushing gently and flossing as normal, being a little more careful around the affected tooth. Skipping oral hygiene in that area can allow decay or gum irritation to develop while you wait to be seen.
When it's urgent versus when it can wait
Most lost fillings are uncomfortable rather than dangerous, and can wait for a routine appointment within a few days as long as you're managing symptoms at home. There are, however, situations where it's worth being seen sooner.
| Situation | Urgency |
|---|---|
| Mild sensitivity, no significant pain | Routine appointment within a few days is usually fine |
| Sharp edge irritating your tongue or cheek | Routine, protect with temporary cement in the meantime |
| Moderate to severe pain, especially at night | See a dentist promptly, may indicate deeper decay or nerve involvement |
| Visible large piece of tooth broken away | See a dentist promptly, tooth may need protection or a crown |
| Swelling of the face or gum, fever | Urgent, treat as a dental emergency |
If you're dealing with any of the more urgent scenarios above, our guide on what to do when you need an emergency dentist is a good next step. And if you're not sure whether what you're feeling is more of a sensitivity issue or an actual crack in the tooth, our article on telling a cracked tooth from a sensitive tooth can help you work out which one it might be.
What your dentist will do
When you're seen, your dentist will usually check the tooth for decay underneath or around where the old filling was, assess how much healthy tooth structure remains, and may take an X-ray to get a clearer picture below the surface. Depending on what they find, treatment can range from simply placing a new filling, through to a crown if a large portion of the tooth is missing or weakened, or in rare cases root canal treatment if the nerve has been affected. The sooner it's assessed, the more likely a simple filling will still be an option rather than something more involved.
Could it actually be an infection?
Occasionally, what feels like "just a lost filling" is accompanied by swelling, a bad taste, or a throbbing ache that suggests infection has set in around or beneath the tooth. This is more likely if the filling had been loose or leaking for some time before it came out completely. If you notice swelling in your gum or face, a persistent bad taste, or a fever alongside the lost filling, it's worth reading our comparison of a gum abscess versus a tooth abscess to understand what you might be dealing with, and treating it as more urgent.
It's also worth noting that swelling isn't always related to a lost filling itself. If you've had a filling placed recently and are now noticing puffiness around it, our article on how long swelling after a filling should last covers what's typical and what isn't.
Frequently asked questions
Is losing a filling a dental emergency?
Not usually. Most lost fillings can wait for a routine appointment within a few days, provided pain is manageable and there's no swelling or fever. Severe pain or facial swelling should be treated urgently.
Can I use super glue to fix a lost filling?
No. Household glues are not designed for use in the mouth and can be harmful if swallowed or if they react with saliva. Use a pharmacy-bought temporary dental cement or dental wax instead.
Will I need a new filling or a crown?
It depends on how much healthy tooth structure remains and whether there's new decay. Small areas are typically refilled, while teeth with more extensive damage may need a crown to protect them from further breakage.
How long can I leave a tooth without a filling?
It's best not to leave it longer than necessary. The exposed area is more prone to further decay, sensitivity and breakage the longer it's left, so aim to be seen within a few days even if you're not in significant pain.
Why does the tooth feel rough or sharp after the filling comes out?
This is usually just the natural contour of the remaining tooth structure, which can feel unfamiliar to your tongue. A temporary dental cement can smooth this over until you're seen.
What if I can't find the piece that fell out?
That's fine. Old filling material generally can't be reused anyway, so your dentist will place a fresh filling rather than trying to reattach the original piece.
A lost filling is usually manageable at home for a few days with the right care, but it shouldn't be left indefinitely. See our current offers or book with a general dentist in Melrose Park.
