Lost Crown or Filling? Here Is What to Do
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Temporary protection, why you need to be seen within 24-48 hours, and the over-the-counter options that actually work
You felt a clunk in your mouth, and now a crown or filling is sitting on your tongue (or worse, you swallowed it without realizing). Lost a crown — what to do is a common search the moment this happens. Good news: this is fixable, and usually not an emergency requiring an ER visit. But the exposed tooth underneath is now vulnerable, so timing matters. As an emergency dentist in St. Charles, IL, Dr. Aqil Valika at Bliss Dental Center sees lost crowns and fillings several times a week. Here is exactly what to do.
First Hour — What to Do Immediately
- Find the crown or filling if you can. Rinse it gently. Save it in a small container or zip-lock bag. If the crown is intact, your dentist can often re-cement it — saving you the cost of a new crown.
- Rinse your mouth gently with warm water to remove debris.
- Examine the exposed tooth. If it has sharp edges, gently smooth them by rubbing your finger across (do not file with anything). If it is causing tongue irritation, you can place orthodontic wax or sugarless gum over it temporarily.
- Avoid chewing on that side — the exposed tooth is now vulnerable to fracture.
- Avoid hot, cold, or sweet foods — exposed dentin is sensitive.
- Call (630) 549-7916 — tell us it is a lost crown or filling. We schedule within 24-48 hours.
Temporary Protection — What to Use (and What Not to)
What works (over-the-counter):
- Temporary dental cement (sold at pharmacies under brand names like Dentemp, Recapit). Mix a small amount, place inside the crown if you have it, press onto the tooth. Holds 1-3 days.
- Petroleum jelly (Vaseline) as a stopgap if no temporary cement available — coats the exposed tooth to reduce sensitivity. Lasts only a few hours but is widely available.
- Sugar-free gum or orthodontic wax over a sharp edge to prevent tongue cuts. Not a true temporary cement but reduces irritation.
What NOT to use:
- Superglue (Krazy Glue). Toxic, can damage the tooth and surrounding tissue. Complicates the dentist’s ability to properly recement the crown later.
- Aspirin pressed against the gum. Burns soft tissue.
- Hot wax applied directly. Can damage tissue and is hard to remove.
Why You Need to Be Seen Within 24-48 Hours
This is the part patients often underestimate. The exposed tooth underneath a lost crown or filling is more vulnerable than you might expect:
Decay risk. The underlying tooth was previously protected by the crown or filling. Bacteria immediately begin colonizing the now-exposed surface. Within days, decay can begin penetrating into the tooth.
Fracture risk. The tooth was prepared for a crown or filling — meaning some natural tooth structure was removed to make room. The remaining tooth is structurally weaker than a normal tooth. Chewing on it can cause it to fracture, sometimes irreparably.
Pulp sensitivity and infection. Exposed dentin is sensitive to temperature and pressure. If the crown was on a tooth that previously had a root canal, the exposed root canal access can let bacteria into the canal — creating an infection that requires new root canal treatment.
The clinical insight: a tooth that lost its crown can usually be saved if seen within 24-48 hours. Waiting 2-3 weeks often turns a simple recementation into a complex restoration or extraction.
Treatment Options at the Visit
What we do at the appointment depends on the situation:
Crown intact and tooth healthy: clean the inside of the crown and the prepared tooth, recement the original crown. Quick visit (~30-45 minutes), inexpensive ($100-$300 for recementation if no other work needed).
Crown lost and decay developing underneath: remove decay, possibly redo any underlying buildup, then either recement the original crown if possible or fabricate a new one. May involve a same-visit CEREC crown if available — see our same-day crowns page.
Filling lost and tooth healthy: replace the filling, typically a composite restoration. Same-day. $150-$400.
Underlying tooth has fractured or developed serious decay: may need root canal, post-and-core buildup, and a new crown. $2,000-$4,000+ total.
Tooth cannot be saved: extraction followed by replacement (implant or bridge). See our implant vs bridge blog post.
Will Insurance Cover This?
Recementation of an existing crown is usually covered at the basic restorative tier (70-80%). Replacement crowns or fillings are covered at major restorative (50%) or basic (70-80%) depending on the procedure. Insurance typically does not cover replacement of a crown that is less than 5-7 years old (the “alternate benefit” rule), so timing matters. We verify before treatment.
Need a Same-Day Visit? Call (630) 549-7916
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