Yes, it happens. Not commonly, but often enough that most dental offices see a few every month. The good news: a crown that has come off is usually not an emergency in the strict sense, and in most cases the crown can be re-cemented back onto the tooth. What matters is what you do in the next few hours and how quickly you get in.
Dr. Zack Finnegan, DMD at Magnolia Smiles in Woodstock, GA handles this often. This guide covers what to do first, why crowns come loose, and when it needs to be treated as urgent.
First: what to do right now
Steps that matter in the first hour.
- Do not swallow the crown. If it came out while you were eating, spit it out and rinse your mouth.
- Find it. A crown that fell out can usually be put back on.
- Rinse the crown gently with warm water. Do not scrub the inside.
- Rinse your mouth. Warm salt water is fine.
- Look at the tooth underneath. If it is sharp, cover it with a small piece of sugar-free gum or a piece of dental wax so it does not cut your tongue or cheek.
- Do not try to glue the crown back on with household glue. It will contaminate the surfaces and often ruins the crown.
- You can try to seat the crown gently back onto the tooth with a small dab of temporary dental cement from a pharmacy, but only if it fits back on easily and does not sit high on the bite. If it does not seat cleanly, leave it out.
- Call the office. Same-day if possible, next business day at the latest.
What to eat until you are seen
- Soft food only.
- Chew on the other side.
- No sticky candy (taffy, caramel).
- No very hot or very cold if the tooth is sensitive.
Why crowns come off
A few reasons show up more often than others.
The cement wore out
Modern dental cements are strong but not eternal. Over 10 to 20 years, cement can slowly wash out. Often this is the story on a crown that came off cleanly and looks intact.
Decay under the crown
If a small cavity started at the margin (edge) of the crown and grew, it can undermine the seal. When enough decay is present, the crown lets go. In this case the tooth may need repair before the crown can be re-cemented.
A crack in the underlying tooth
If the tooth under the crown cracked, the crown may separate. Sometimes the crack extends to a point where the tooth cannot be re-crowned and needs extraction.
Trauma
A hit to the mouth or biting down on something hard can pop a crown off. Sometimes the crown is fine and can be re-cemented. Sometimes the tooth is damaged and needs additional treatment.
A poorly seated crown
Occasionally a newer crown that never fully seated releases early. Your dentist will evaluate why.
When it is urgent (call the same day)
- Pain that is more than mild sensitivity.
- Swelling in the face or gum.
- Fever.
- You lost the crown and cannot find it.
- The tooth underneath is broken or sharp.
- Bleeding from the site.
- The crown was on a front tooth and you have a work or social commitment.
Any of these? Learn more about emergency dentistry at Magnolia Smiles and call the office.
What the visit typically looks like
- Exam and X-ray to see what happened underneath.
- If the tooth is intact and the crown is intact: cleaning and re-cementation. Often 30 to 45 minutes.
- If decay is present under the crown: the decay is cleaned out. Depending on how much tooth is left, the crown may be re-cemented, or a new crown may be needed.
- If the tooth is cracked: options are discussed, from re-cementing (if safe) to root canal plus new crown, to extraction and replacement.
How long can you leave a loose crown out?
- A few hours to a day is usually fine. The tooth may become sensitive to cold or air.
- Several days and the neighboring teeth may start to shift slightly, making it harder to seat the crown.
- A few weeks and shifting can be enough that a new crown is needed rather than re-cementation. Sensitivity can also become significant.
Do not wait a month. The longer you wait, the more likely a simple re-cement becomes a bigger visit.
How to protect crowns long term
- Cleanings and exams every six months.
- Do not chew ice, pens, nails, or popcorn kernels.
- Use a night guard if you grind.
- Do not use your teeth as tools.
Learn more about dental crowns at Magnolia Smiles or restorative dentistry in Woodstock, GA.
Frequently asked questions
Should I use super glue?
No. Household glues are not safe for internal use and often ruin the crown so it cannot be re-cemented.
Can I re-cement it myself with pharmacy temporary cement?
For a short-term fix (a few hours before you can be seen), yes, if the crown seats cleanly. Otherwise leave it out and see the office.
Will insurance cover re-cementation?
Most plans cover it, sometimes with a small copay. New crowns are covered under separate benefits.
What if the crown broke?
If the crown itself fractured, it usually needs to be remade. The office will discuss options.
Can this happen again on the same tooth?
If the underlying reason (decay, crack, high bite) is addressed, no. If the original cement just wore out, re-cementation is usually stable.
What if I lost the crown?
A new crown can be made. Often a scan or impression is taken at the visit and a same-day or lab-fabricated crown is placed within a couple of weeks.
Ready to get it back in place?
If your crown just came off, do not wait days. Contact Magnolia Smiles to book a same-day or next-day visit.
Reviewed by Dr. Zack Finnegan, DMD. Magnolia Smiles, Woodstock, GA. This article is for general education and does not replace an in-person exam.