When a crown falls out: a 24-hour action plan
A crown coming off in the middle of dinner is one of the most common after-hours calls we get. It is also one of the most fixable problems in dentistry — if you do the right things in the first hour. This is the playbook we walk patients through on the phone.
The first sixty seconds
Find the crown. Do not throw it away. Rinse it gently under cool water. Look at it: is it intact, or did it come off with a piece of your tooth still inside it? Both situations are recoverable, but the second one matters for what we will do at the appointment.
Now look at the tooth. If you can see metal or post-like material sticking up, that is normal. If the tooth is bleeding, the gum tissue around it likely got irritated when the crown shifted — rinse with warm salt water for thirty seconds and the bleeding usually stops.
The next hour
If the crown is intact and you can see clearly where it fits, you can try to seat it back temporarily. This is not a permanent fix. It is a way to protect the tooth underneath until you can be seen.
- Dry the inside of the crown with a paper towel.
- Dry the tooth itself by biting on a clean piece of gauze for about thirty seconds.
- Place a small amount of over-the-counter temporary dental cement (sold as Dentemp, Temparin, or similar) inside the crown — about a grain-of-rice amount.
- Seat the crown onto the tooth firmly and bite down on a soft cloth or a clean piece of gauze for one to two minutes.
- Wipe away any excess cement that squeezes out at the gum line.
Do not use household glue. Not super glue, not Krazy Glue, not anything from a hardware store. These are toxic to oral tissue and they make the eventual recement either difficult or impossible.
If you cannot get the crown back on
Do not force it. If the fit feels off, the crown probably came off with a small piece of tooth structure inside it — meaning the geometry has changed. Wrap the crown in tissue, put it in a small container or envelope, and bring it with you to the appointment. The tooth underneath is sensitive but generally fine; sugar-free gum or a small ball of dental wax pressed over the tooth surface helps with sensitivity until you can be seen.
When it is actually an emergency
Call us same-day, not next-day, if you have any of the following:
- The tooth underneath is sharp enough that it is cutting your tongue or lip.
- Pain that is throbbing, waking you up at night, or worsening over the first 24 hours.
- Swelling of the gum, cheek, or jaw on that side.
- A bad taste or visible discharge near the tooth.
- Fever.
The first one is a comfort issue we can usually solve over the phone with wax. The other four can be signs the underlying tooth has an infection, and infections do not wait.
What to expect at the appointment
If the crown is intact and the tooth underneath is healthy, the visit takes about 30 minutes. We clean both surfaces, check the fit, and recement the crown with permanent dental cement. You walk out chewing on it.
If the crown came off because the tooth underneath fractured or decayed, the visit is longer and the conversation is different. We may need to rebuild the tooth structure with a core buildup before the crown will hold, or in some cases the tooth will need a new crown entirely. We will walk you through the options and the costs before doing anything.
Why crowns come off
The two most common reasons are decay underneath the crown margin (the cement seal failed, food slipped under, and a cavity formed) and chewing on something hard the crown was not designed for — ice, popcorn kernels, or hard candy. Neither of those is your fault in any meaningful sense, and both are fixable.
Call us as soon as you notice it. The longer the tooth underneath is exposed, the more likely it is that we will need to do more than a simple recement.