Your crown has come out — what to do before you reach the practice

Key takeaways

• If your crown has come out, keep it and do not glue it back with anything at home — household adhesive is often what decides that the restoration can no longer be re-seated.
• The urgency of the appointment is determined by the inside of the crown: an empty crown usually means a few days, while a post or a fragment of tooth means an urgent appointment.
• A mobile crown on an implant is most often a loosened screw — a mechanical problem that should not be postponed.
• Spontaneous pain, swelling or fever mean contacting the practice the same day.
• Delay reduces the chance that the same crown will still fit.

A sandwich, a Friday evening, the sensation of something hard on the tongue. The fragment spat into your hand turns out to be a dental crown that has given no trouble for years. The first reaction is almost always the same: does this hurt, can it be glued back, and is an emergency appointment needed?

The shortest answer is this: keep the crown, do not glue it with anything, and arrange an appointment — and how urgent that appointment is depends on what can be seen inside the restoration. The situation looks dramatic, but it is usually not an emergency. Behind the colloquial phrase "my crown came out" — much like "the crown fell off" or "the crown is moving" — lie three clinical situations with entirely different prognoses. In one, the same crown will go back during a single appointment. In the second, the tooth may already be beyond saving. In the third, the problem has nothing to do with cement and everything to do with the mechanics of a screw connection. Telling them apart requires no medical knowledge — you simply need to know what to look for.

The first five minutes after your crown comes out: what to do and what never to do

Let us begin with the one thing that most often decides whether the restoration can be saved.

Never glue the crown back yourself. Cyanoacrylate adhesives, commonly known as superglue, and office glues are not intended for contact with dental tissues. They fill the space designed for cement, set irreversibly and make correct seating of the crown impossible. Denture adhesives, although they are intended for use in the mouth, will not hold a rigid crown on an abutment tooth and merely create the illusion that the restoration is holding. Removing such an adhesive usually ends in destroying the restoration — and then, instead of re-cementation, a new crown becomes necessary. The same applies to forcing the crown back into place and to "adjusting" the abutment tooth at home. Over-the-counter temporary cementation products may be used only as a stopgap, and only when your dentist has specifically advised it.

What is worth doing:

• Find the crown and do not throw it away. In most cases it is this crown that will go back into place.
• Rinse it in lukewarm water and store it in a dry, rigid container. A crown wrapped in a tissue usually ends up in the bin.
• Examine the inside of the crown in good light — this is the key step, described in the next section. It is worth taking a photograph with your phone; it will make the conversation at reception easier.
• Gently clean the exposed abutment tooth (the prepared tooth stump on which the crown was seated) with a toothbrush. Exposed dentine (the tissue beneath the enamel, considerably more sensitive than enamel) reacts to cold, heat and sweet foods.
• Do not chew on that side and avoid sticky foods.
• Do not put the crown back "to see whether it fits" overnight — a loose restoration can be swallowed or inhaled.
• Arrange an appointment and describe at reception what can be seen inside the crown.

Look inside the crown — a decision tree for three scenarios

The inside of a crown that has come out is diagnostic information to which the patient has access first. It comes down to a single question: is the crown empty, or is something lodged inside it?

How to tell whether it is a crown on an implant or on your own tooth

Many patients no longer remember this after several years, and it is precisely this information that begins the assessment. In a crown screwed to an implant you can see a round screw access hole, usually filled with tooth-coloured material. A cement-retained implant crown has no such hole and, from the inside, looks much like a crown on a natural tooth — in that case what settles the matter is what can be seen in the gum: a smooth abutment, either metal or white ceramic, rather than tooth tissue.

What can be seen inside the crown	Probable situation	How urgent the appointment is
An empty crown with hard cement remnants on the walls, and a tooth stump visible in the mouth	Loss of retention (the crown's ability to stay on the abutment tooth) — cement washout or cement fatigue	Within a few days
Dark, soft or crumbling tissue, unpleasant odour	Secondary caries beneath the crown	Urgently, within 1–2 days
A metal or fibre post protruding from the inside	Post and core together with the crown — suspected fracture	Urgently
A distinct fragment of hard tooth tissue	Fracture of the abutment tooth or of the root	Urgently
A screw access hole in the crown, or a smooth abutment visible in the gum	Crown on an implant — most often a loosened screw	Without delay, even if there is no pain

In our dental practice at Modern Dental & Orthodontics (Klinika MDO) we observe that the prognosis is determined not by the crown coming out itself, but by what has been left underneath it — and this information is the most valuable one as early as the telephone conversation.

Red flags — an appointment the same day

Regardless of what can be seen inside the crown, the following symptoms mean that you should not wait:

• spontaneous pain, arising without any stimulus and worsening at night;
• swelling of the cheek, the gum or the submandibular region;
• fever, general malaise, enlarged lymph nodes;
• a sharp edge of the abutment tooth cutting the tongue or the cheek;
• bleeding from the area of the exposed tooth that does not subside;
• severe, persistent pain on biting.

Scenario 1: a crown with an intact abutment tooth

This is the variant with the most predictable prognosis. The crown that has come out is empty inside, its walls are covered with hard cement, and a smooth tooth stump is visible in the mouth. It is therefore the cement bond that has failed, not the tooth.

There are several possible reasons: cement fatigue and washout; an abutment tooth that is too short or prepared with too much taper, giving the cement too little surface to grip; or secondary caries (caries at the margin of an existing restoration). In a study covering 1,116 fixed restorations in 423 patients, with a mean follow-up of seven years, secondary caries was found in 94 cases — roughly one restoration in twelve. The authors emphasise that oral hygiene clearly reduced this risk.

If the abutment tooth is sound and the crown undamaged, the standard approach is to clean both surfaces and re-cement the same crown — usually within a single appointment. If there is caries beneath the crown, it may need to be removed and the abutment tooth rebuilt, and where the cavity is deep, a new crown may be required. You can read more about the types of restoration on our page devoted to dental crowns at our practice.

Scenario 2: a crown with a post and core

If the crown has come out with a post — that is, a metal or fibre post protrudes from inside the restoration — the situation is different. The post and core has come out together with the crown; it is a component anchored in the canal of a root-treated tooth. Such teeth have less of their own tissue and are more prone to fracture.

A post that has come out complete usually means one of two things: loss of the bond between the post and the root, or a root fracture. The second variant is serious — a fracture line running along the root usually makes it impossible to keep the tooth.

The decision rests with the dentist and requires an examination and a radiograph, and sometimes cone-beam computed tomography. A review of studies analysing nearly 2,900 root-treated teeth identified what is most strongly associated with vertical root fracture. All of these factors are assessed by the dentist: periodontal pocket depth measured with a probe, the appearance on the radiograph, root canal overfilling, and the width of the canal in relation to the thickness of the root. None of them alone confirms the diagnosis.

The practical conclusion: a post inside the crown is a signal for an urgent appointment, even if nothing hurts. You should not push the post back into the canal — this risks damaging the root and driving bacteria deeper. Why root-treated teeth call for a particular prosthodontic approach is described in our article on the crown after root canal treatment.

Scenario 3: a crown on an implant and a loosened screw

When a crown has come off an implant, the mechanism is usually different from that on a natural tooth. An implant crown is connected to the implant, as a rule, through an abutment (the intermediate component between the implant and the crown) and a screw, and a common technical complication of this assembly is screw loosening rather than loss of cement. Patients describe it by saying that the crown on the implant is moving, even though the neighbouring teeth are stable. The answer to the question of why the crown is moving is almost never "because the implant has failed" — the implant usually remains stable, and the problem concerns the prosthetic components above it.

A meta-analysis covering several dozen studies of single all-ceramic implant crowns shows that screw loosening and loss of retention are typical technical complications in this group of restorations, and that their frequency depends on the type of ceramic — monolithic zirconia crowns showed them more often than veneered crowns. In a seven-and-a-half-year randomised study involving 44 patients, cement-retained crowns were associated with a significantly higher number of complications than screw-retained ones. In a study of 567 implant crowns in 358 patients, with a follow-up reaching nearly thirteen years, avoiding semi-permanent cements reduced the risk of loss of retention by roughly half, without affecting the survival of the implants themselves.

An appointment for a moving crown on an implant should not be put off "until Monday". A working loose screw may fracture inside the implant, and removing the fractured fragment is a considerably more difficult procedure than simply retightening it. The differences between the two designs are discussed in our comparison of an implant crown and a crown on a natural tooth.

When a bridge, rather than a single crown, comes out

A bridge rests on at least two abutment teeth and replaces the missing tooth between them. If it has come out complete, the approach is the same as with a crown: keep it, do not glue it, examine the inside of both retainer crowns.

It does happen, however, that only one abutment becomes decemented — the bridge then stays in the mouth, moves slightly, and plaque that cannot be brushed away accumulates beneath the loosened crown. This is an insidious situation: the patient sees nothing alarming, while caries develops for months. A bridge that is moving therefore needs an appointment even when it is holding "well enough".

What happens when the appointment is postponed

Teeth do not stay still. The prepared abutment tooth is narrower than the crown, so the contact points with its neighbours disappear, and the opposing tooth may begin to move towards the space left by the lost crown. The changes are slow, but they can be large enough for the same crown to stop fitting after a longer period.

Two further mechanisms come into play. Exposed dentine is soft and succumbs to caries more quickly. A thin, unprotected tooth stump is also easier to fracture when you bite down accidentally — and a fracture of the abutment tooth below gum level turns a simple procedure into a decision about surgical crown lengthening, orthodontic extrusion, or extraction of the tooth.

Why crowns become decemented

The fact that a crown has come out is rarely a coincidence. Four factors are usually involved: the geometry of the abutment tooth; the type of cement and the conditions under which it was used, since moisture during cementation and semi-permanent cements increase the risk of loss of retention; occlusal forces, including bruxism (habitual teeth grinding, most often at night); and finally secondary caries, which undermines the bond from the crown margin.

In a retrospective study of 1,037 crowns on natural teeth, with a mean follow-up of over eleven years, nearly nine crowns in ten were still functioning without failure after five years, and eight in ten after ten years. The main reasons for failure were loss of retention, tooth loss and fracture of the restoration; a separate, well-documented reason for replacement is secondary caries, and in ceramic-veneered crowns, chipping. Some of these causes depend on everyday habits: cleaning the gum–crown margin with floss or an interdental brush, regular check-ups with radiographs, and an occlusal splint where bruxism has been diagnosed.

In conversations with patients coming to Modern Dental & Orthodontics (Klinika MDO), the recurring question is whether a crown that has come out once will come out again. The answer depends on the cause: if cement fatigue on a sound abutment tooth was the reason, re-seating is usually durable. If the problem lies in the geometry of the abutment tooth or in caries, re-cementation alone may prove to be a temporary solution.

How to prepare for the appointment

A short list that shortens the appointment and helps to determine its scope:

• Bring the crown complete, in a dry container — including when it is cracked.
• Bring your implant passport and your most recent radiograph.
• Note down when the crown came out and whether it had been moving beforehand.
• Write down the medicines you take — they matter if a procedure becomes necessary.
• At reception, say what can be seen inside the crown.

Re-cementing the crown itself — that is, seating an undamaged restoration on an intact abutment tooth — is the simplest procedure. The amount of work increases with what the dentist finds beneath the crown, which is why a reliable estimate can only be given after an examination, not over the telephone.

Frequently asked questions

Can I glue the crown back myself?

No. Household adhesives, including cyanoacrylates, irreversibly fill the space intended for cement and most often make it impossible to re-seat the crown. This is a common reason why a restoration can no longer be saved. Over-the-counter temporary cementation products are used only as a stopgap and only on the explicit advice of a dentist.

Can the same crown be re-cemented?

In most cases yes, provided that the crown is undamaged, the abutment tooth intact, and there is no extensive caries beneath the restoration. The conditions are that you bring the crown complete and have not glued it at home. If the abutment tooth needs rebuilding or the crown is cracked, a new restoration may be required.

How much time do I have to arrange an appointment when a crown comes out?

With an empty crown and no symptoms, an appointment within a few days is usually enough. A post, a fragment of tooth or dark tissue inside the crown means an urgent appointment, preferably within one or two days. A moving crown on an implant requires contact without delay. Spontaneous pain, swelling or fever require contacting the practice the same day.

I have swallowed the crown — what now?

A small swallowed object most often passes through the digestive tract on its own and requires no intervention, but it is worth reporting to a doctor. It is different if there is any suspicion that the crown has entered the airway: coughing, breathlessness, wheezing or chest pain mean that immediate medical help is needed.

A crown has come out of a front tooth — can anything be done straight away

Usually yes. If the abutment tooth is intact and the crown undamaged, it can most often be seated during a single appointment. Where that is not possible, a temporary crown made in the practice serves as a stopgap, restoring appearance while the new restoration is prepared. What you should not do is mask the gap with adhesive or with products used on your own initiative.

What should I do if a piece of tooth has stayed inside the crown?

Keep the crown together with the fragment and do not try to fit anything back together. The presence of hard tooth tissue inside means a fracture of the abutment tooth or of the root, and the prognosis depends on the course of the fracture line. The dentist will assess this on the basis of an examination and a radiograph. Some such teeth can be rebuilt; others qualify for extraction.

Why is my crown on an implant moving?

Most often because of a loosened screw connecting the crown and abutment to the implant, and less frequently because of loss of cement. A moving crown on an implant requires a prompt appointment, because a working screw may fracture inside the implant, and removing it is then considerably more difficult than simply retightening it.

Can I eat with an exposed abutment tooth?

You can, but carefully and on the opposite side. Exposed dentine may be sensitive to cold, heat and sweet foods, and an unprotected abutment tooth is more easily fractured. Until your appointment, it is worth avoiding hard and sticky foods and keeping the area meticulously clean, because an exposed surface accumulates dental plaque more quickly.

Does a crown coming out hurt?

It usually does not hurt at the very moment the crown comes out. Some teeth beneath crowns have been root treated, but most retain a vital pulp — in those patients the exposed dentine can be distinctly sensitive. Symptoms appear later: sensitivity, pain on biting or spontaneous pain. The last of these, particularly with swelling or fever, requires urgent consultation.

Why did the crown come off after several years?

Cement wears down gradually under chewing forces and the conditions of the oral cavity. Added to this are secondary caries at the crown margin, bruxism and unfavourable geometry of the abutment tooth. Decementation after several years is therefore usually the sum of several factors rather than the result of a single event.

Summary

A crown that has come out looks alarming, but it is rarely an emergency. What matters most is what not to do: do not reach for household adhesive, do not force the crown back into place, and do not throw it away. The next step is to look inside — an empty crown with cement remnants usually means a purely technical problem, while a post or a fragment of tooth moves the matter into the urgent category. Spontaneous pain, swelling or fever always mean contacting the practice the same day. And finally: the longer the abutment tooth remains without its crown, the smaller the chance that the same crown will still fit it.

Read more:

• Dental crowns — prosthetics at Modern Dental & Orthodontics (Klinika MDO)
• Post and core — when it is necessary
• An implant crown versus a crown on a natural tooth — a comparison
• The crown after root canal treatment — why it is needed
• The temporary crown — why it is fitted and how to look after it

Content and liability disclaimer

This article is informational and educational in nature and does not constitute medical advice, a diagnosis or a therapeutic recommendation — it does not replace a consultation with a specialist. If you are experiencing symptoms, have doubts or are facing a decision about treatment, consult a dentist. The methods described and the data cited are general in nature. The results of scientific studies relate to populations, not to an individual patient. The course and outcome of therapy depend on the individual clinical situation and may vary between patients. No information contained in this article constitutes a guarantee of result. The content has been prepared with due care, based on publicly available medical knowledge and the scientific publications indicated in the Sources section. We do not advise taking or refraining from any health-related action solely on the basis of the content of this article, without prior consultation with a doctor.

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