How to Temporarily Glue a Crown Back on a Tooth

Over-the-counter temporary dental cement, available at most pharmacies, can hold a loose crown in place for a few days until you reach a dentist. The process itself is straightforward: clean the crown, apply a small amount of temporary cement inside it, and press it back onto the prepared tooth. But the details matter more than the broad strokes, because a crown that is poorly reattached can shift while you eat, trap bacteria against the exposed tooth, or come loose again at a dangerous moment. Here is what you actually need to know to do this safely and buy yourself time before a professional visit.

First Steps When a Crown Comes Off

A crown can loosen for several reasons: the cement underneath gradually washes out over years, decay forms under the margin, a hard or sticky food catches the edge, or the tooth underneath has fractured. Whatever the cause, the immediate priority is keeping the crown safe and the exposed tooth comfortable. The prepared tooth underneath a crown has been filed down to a peg shape, and it is sensitive to temperature, pressure, and air. You will likely feel a sharp zing from cold drinks or even from breathing through your mouth.

If the crown comes off while you are eating, check that you have not swallowed it. Accidental ingestion of dental restorations is a recognized complication, and while most swallowed crowns pass through the digestive system without incident, aspiration into the airway is a genuinely dangerous possibility that can require surgical intervention.¹ If you feel any choking, coughing, or difficulty breathing after a crown comes loose, treat it as an emergency.

Assuming you have the crown in hand, rinse it gently under warm water. Look inside it: you may see old cement residue, dark spots, or a hollow that still roughly matches the shape of your prepared tooth. If the crown is visibly cracked, has a hole through the top, or the inside looks nothing like a tooth stump anymore, it may not be reusable. In that case, skip the re-cementing and go straight to your dentist. If it looks intact, you can move to a temporary fix.

Choosing the Right Temporary Cement

Pharmacies and online retailers sell temporary dental cement specifically designed for this situation. Common brand names include Dentemp, Recapit, and similar products marketed for lost crowns, loose caps, and temporary fillings. These are zinc oxide–based cements that set to a semi-firm consistency. They hold the crown in place for chewing but are designed to be weak enough that your dentist can easily remove the crown later without damaging it or the tooth.

This weak-by-design quality is actually the most important feature. Professional permanent cements, including glass ionomer and resin-based adhesive cements, bond with substantially higher retentive strength.² Temporary OTC cement is not trying to match that strength. It is giving you a few days’ reprieve, not a permanent repair. Expecting more from it leads to frustration or, worse, to reaching for something stronger that can cause real problems.

What Not to Use

The temptation to reach for super glue is strong, and the internet is full of people who claim it worked fine for them. It is a bad idea for several reasons. Cyanoacrylate adhesives, the chemical family that includes super glue and Krazy Glue, bond rigidly and permanently to many surfaces. That is exactly what you do not want. If the crown is cemented on with super glue and your dentist later needs to remove it to check for decay, clean the tooth, or adjust the fit, the removal process can crack the crown or fracture the underlying tooth structure.

Beyond the mechanical problem, there is a biological one. Laboratory research on commercial cyanoacrylate adhesives shows that polymerized super glue continues to release substances toxic to human oral cells for at least two weeks, creating zones of cell death in surrounding tissue.³ That study tested it on cultured oral fibroblasts, the connective tissue cells in your gums and the lining of your mouth. The finding is not that super glue causes immediate, dramatic harm. It is that it is not inert: it keeps leaching irritants into the very tissue it sits against. Medical-grade cyanoacrylates exist and are used in some clinical applications, but the tube of super glue in your junk drawer is not medical grade.

Other household adhesives are equally problematic. Epoxy sets like stone and is nearly impossible for a dentist to work with afterward. Gorilla Glue expands as it cures, which can push the crown out of alignment or wedge material into the gum line. Regular white glue and craft adhesives dissolve in saliva almost immediately and offer no real hold. Stick with products made for dental use.

Step by Step: Reattaching the Crown

Once you have your OTC temporary cement and the intact crown, the process goes like this:

Clean the crown: Remove any old cement or debris from inside the crown using a toothpick, a small brush, or even the tip of a paper clip. Rinse it well with warm water. You want the inside surface as clean as possible so the temporary cement can grip.
Clean the tooth: Gently brush the exposed tooth stump with a soft toothbrush and water. Do not scrub aggressively; the exposed dentin is sensitive and the gum tissue around it may be irritated. The goal is to remove food particles and plaque, not to sterilize the surface.
Dry everything: Pat the inside of the crown and the tooth stump dry with a piece of gauze or a clean tissue. Cement adheres better to a dry surface than a wet one.
Apply the cement: Follow the product’s directions, but the general approach is to place a thin, even layer of cement inside the crown. You do not need much. A thick glob will ooze out the sides when you press the crown on, and excess cement along the gum line is uncomfortable and hard to clean.
Seat the crown: Press the crown onto the tooth stump firmly. Bite down gently on a cotton roll, folded gauze, or even a damp tea bag to push it into position. Hold steady pressure for a couple of minutes. If you have no cotton roll, bite together slowly and check that the crown feels like it is sitting at the right height. If one side of your bite hits the crown first while the rest of your teeth do not touch, the crown is sitting too high and needs to be repositioned.
Clean up excess: Use a toothpick to carefully remove any cement that squeezed out around the margins. Floss gently between the crowned tooth and its neighbors to make sure cement has not bridged the gap and locked adjacent teeth together.

Wait at least an hour before eating anything, and stick to soft foods on that side for the first day. The cement needs time to reach its full set. Even then, avoid sticky or very hard foods on the crowned tooth until your dentist recements it permanently.

Why the Fit Matters More Than the Glue

People often blame the cement when a temporarily reattached crown keeps falling off, but the real issue is usually fit. A crown that was made to sit precisely on the prepared tooth holds in place partly through friction and the geometry of the tooth stump. If the tooth underneath has changed shape due to decay, if a chunk of the stump has broken off, or if old cement has built up inside the crown and you have not cleaned it out completely, the crown will not seat properly. No temporary cement can compensate for a crown that rocks on a misshapen foundation.

If you press the crown on and it immediately feels loose, tilts, or pops off with light pressure, something about the fit has changed. In that case, you are better off not wearing the crown at all. Protect the exposed tooth by covering it with a small dab of the temporary cement alone (it can serve as a makeshift temporary filling), avoid chewing on that side, and get to a dentist promptly. A crown that is constantly coming off and being re-cemented at home is a crown you might accidentally swallow in your sleep or while eating, and that is a risk worth avoiding. Reports in the dental literature document cases where even children have accidentally ingested crowns during dental procedures themselves, so the hazard is not theoretical.⁴

Caring for the Temporary Fix

Once the crown is back in place, treat it like it is barely hanging on, because it is. Temporary cement is meant to last days, not weeks. A few guidelines will help you get to your dental appointment without another pop-off:

Chew on the other side: Shift your bite load away from the crown as much as you can. Even soft foods generate meaningful force, so reducing how often the crown absorbs direct pressure makes a real difference.
Avoid sticky foods entirely: Caramel, taffy, chewing gum, and dried fruit can grab the crown and pull it right off. This is the single most common way a temporarily cemented crown fails at home.
Brush gently: Keep the area clean, but do not scrub the crown aggressively. Light brushing with a soft-bristled toothbrush is fine.
Floss carefully: When flossing around the crown, pull the floss out to the side rather than snapping it upward through the contact. Pulling upward can catch the crown’s edge and lift it off.
Skip whitening products: Whitening toothpastes and strips can seep under the temporary cement and irritate the sensitive exposed dentin underneath.

If the crown does fall off again despite your best efforts, you can re-cement it following the same steps. Clean off the old temporary cement first, both from the crown and the tooth, then start fresh. Each cycle of removing and re-cementing reduces how cleanly the crown sits, though, so try to limit how many rounds you go through before seeing your dentist.

What Happens When the Dentist Re-Cements Permanently

At the dental office, the process differs from your home fix in a few meaningful ways. The dentist will first evaluate whether the crown is still usable. They will check for decay on the tooth stump, often with an X-ray, and examine the crown under magnification for cracks, worn margins, or poor fit. If everything checks out, the tooth surface is cleaned thoroughly. Research on temporary cement removal shows that both mechanical cleaning (scraping and polishing) and chemical cleaning methods effectively clear residual temporary cement from the tooth surface and restore bond strength for permanent recementation.⁵

The permanent cement your dentist uses is a different category of material from what you used at home. Professional dental cements vary widely in retention strength, with resin-based adhesive cements producing the highest bond values and conventional glass ionomer cements producing lower but still clinically reliable retention.⁶ Your dentist will choose the cement type based on the crown material, the tooth’s condition, and whether the crown might need to be removed again in the future. Sometimes a dentist will deliberately use a weaker cement on a crown that sits over a tooth with a questionable nerve, leaving the option to remove it more easily if a root canal becomes necessary later.

When a Crown Keeps Falling Off

If your crown has come off more than once or twice in a relatively short period, the crown itself may be at the end of its useful life. Crowns do not last forever. The average lifespan varies with the material and how well you care for it, but eventually the seal between crown and tooth breaks down, decay creeps in underneath, or the tooth structure changes enough that the fit degrades. A repeatedly failing crown is your mouth telling you something has changed, and temporary cement is not the answer to a structural problem.

Occasionally the issue is not the crown but the tooth. A tooth that has fractured vertically underneath a crown will not hold any cement, temporary or permanent. The crown may feel like it seats fine, but it shifts under biting pressure because the tooth itself is splitting. This scenario often comes with a sharp pain when you bite down and release, almost like a rebound sting. If that describes what you are feeling, skipping the at-home re-cement and heading to your dentist quickly is the right call, because a vertical root fracture sometimes means the tooth cannot be saved, and delaying diagnosis does not help.

Managing Pain While You Wait

The exposed tooth stump under a lost crown is often sensitive, but the intensity varies a lot depending on whether the tooth has had a root canal. A root-canal-treated tooth has no living nerve, so losing the crown usually causes no pain at all beyond mild gum irritation. A tooth that still has its nerve, on the other hand, can be genuinely uncomfortable. Cold air, cold liquids, and even the pressure of your tongue against the stump can trigger sharp, shooting pain.

Over-the-counter pain relievers like ibuprofen work well for this kind of discomfort because it is largely inflammatory in nature. Clove oil, dabbed on the exposed tooth with a cotton swab, contains eugenol, which is the same active ingredient used in many professional dental sedative dressings. It provides a temporary numbing effect and has a long history of use in dentistry. If you have re-cemented the crown successfully, the sensitivity should drop dramatically once the tooth is covered and insulated again.

One thing to watch for is escalating pain that does not improve once the crown is back on, especially if it becomes throbbing or wakes you up at night. That pattern suggests the nerve inside the tooth is inflamed or infected, and temporary cement will not fix an infection. In that situation, you are dealing with a problem beyond the lost crown itself, and a dentist visit becomes more urgent.

Dental Emergencies on Weekends and Holidays

Crowns have a knack for falling off on Friday evenings, holiday weekends, and during vacations. If you cannot reach a dentist for several days, the temporary cement approach described above works well as a bridge. Keep a small kit in your travel bag if you have a history of crown trouble: a tube of OTC temporary dental cement, a few cotton rolls or gauze squares, and a toothpick. The entire kit fits in a sandwich bag and costs a few dollars.

If you are truly in a bind and cannot get to a pharmacy, some people use a tiny dab of toothpaste or denture adhesive cream inside the crown just to keep it in place for a few hours. Neither of these is a real cement and neither will hold for long, but they can get you through a meal or a social event in a pinch. The crown will feel loose, and you should not chew on it. Remove it before sleeping so you do not risk swallowing or aspirating it overnight.

For people who travel frequently or live in areas with limited dental access, having that emergency kit on hand is genuinely useful. A lost crown is not usually a medical emergency in the classic sense, but the discomfort, the risk of further damage to the unprotected tooth, and the possibility of swallowing the crown all make a quick temporary fix worthwhile until professional care is available.