What Is a Dental Crown? A Patient Guide

Short answer

• A dental crown is a tooth shaped covering, often called a cap, that fits over the whole visible part of a tooth above the gumline. The American Dental Association (ADA) explains that a crown restores a tooth to its normal shape, size, and function, and that its purpose is to make the tooth stronger or improve the way it looks. A dentist may recommend one when a filling alone can no longer restore the tooth reliably, for example after extensive decay, a large failing filling, or a crack. Crowns are made from porcelain, ceramic, zirconia, metal, and porcelain fused to metal, and are usually fitted over two visits, with a temporary crown in between. This article is general patient information only, not a diagnosis or a recommendation for any individual tooth. Whether a crown, a filling, an onlay, or another option fits your situation depends on an examination, and often on X rays, by your own dentist. If you have severe pain, swelling, a fever, or a broken tooth, contact a dentist promptly.

What a Dental Crown Is

A crown covers the part of the tooth you can see, down to near the gumline, and is cemented or bonded in place. The root and the remaining natural tooth structure stay underneath. A crown is a repair of an existing tooth, not a replacement for a missing one.

To make room for it, the dentist reshapes the tooth by removing some of its outer portion, so the finished crown does not look or feel bulky. The ADA notes that any decay is removed during that preparation, and that if too much tooth has been lost, the dentist may build up the core of the tooth so the crown has enough support. The edge where the crown meets the natural tooth is called the margin. Much of a crown’s long term success depends on how well that margin fits and how well it is kept clean.

A crown on a dental implant is different: there is no natural tooth underneath, and the crown attaches to an implant post in the jaw, as part of implant treatment. A crown also differs from a veneer, a thin shell covering only the front surface. Leeds Teaching Hospitals NHS Trust notes that veneers remove some tooth structure, but not as much as a crown, because they do not wrap around the whole tooth.

When a Dentist May Recommend a Crown

A large cavity or a large filling

The ADA notes that a crown can strengthen a tooth with a large filling when there is not enough tooth remaining to hold the filling, and lists a cavity too large for a filling as a common reason for a crown. A filling depends on the walls around it for support, and when decay or an old filling has taken away much of the tooth, those walls can become thin and fracture prone. A crown surrounds and supports what remains instead. Our guide to how to get rid of cavities and the treatment options explains how dentists choose between a filling and larger treatment based on how far decay has gone.

After root canal treatment

Root canal treatment removes infected or damaged tissue inside a tooth, which is then sealed and restored. The ADA patient guidance lists having had root canal treatment as a reason for a crown, because the crown protects the restored tooth. The benefit is clearest for back teeth, which take heavy chewing forces and have often lost much structure before treatment: a systematic review of root filled teeth found higher long term survival for teeth restored with crowns than without crown coverage. Front teeth differ: a front tooth that is otherwise intact, with only the small opening made for treatment, can often be restored with a tooth colored filling, and may need a crown only if large fillings have weakened it or its shape or color needs a major change. Not every root treated tooth automatically needs a crown. Our article on how cavities turn into root canals explains the process that leads to that treatment.

Sometimes a post is also involved. Leeds Teaching Hospitals NHS Trust explains that a metal or fiber post may be cemented into a root treated tooth to help rebuild a severely broken down tooth, with filling material built up around it as a core, before the crown is made. A post does not strengthen the root. It helps hold the core in place when very little tooth remains above the gum.

A cracked, broken, or worn tooth

A crown can protect and support a cracked tooth, restore a broken tooth, and rebuild a worn down tooth, among the uses Cleveland Clinic lists. Covering the tooth completely can hold the remaining parts together and spread biting forces more evenly, which matters most when a crack involves one of the pointed parts of the chewing surface, called cusps. Not every crack can be crowned: a crack extending deep below the gum, or splitting the root, may mean the tooth cannot be saved. Repair choices for smaller chips are covered in our guide to how chipped teeth are fixed.

To hold a bridge or cover an implant

The ADA notes that crowns can be used to attach bridges, which replace missing teeth by anchoring an artificial tooth to crowns on the teeth beside the gap, and a crown is also the visible tooth placed on top of a dental implant.

To cover a badly shaped or discolored tooth

A crown can cover a tooth that is severely discolored or badly shaped, as the ADA describes. This involves removing more tooth structure than whitening or a veneer, so for a healthy tooth where color or shape alone is the concern, a dentist will usually discuss those options first.

When a Crown May Not Be the Right Choice

Leeds Teaching Hospitals NHS Trust lists situations where a crown may not be suitable, including poor oral hygiene, a high rate of new decay, active and extensive gum disease, heavy clenching or grinding, and minimally damaged teeth, and notes crowns are used cautiously in young patients. The reasoning is practical: a crown margin collects plaque like any tooth edge, so uncontrolled decay or gum disease can undermine a new crown quickly, and treating those problems first usually gives a better result. For minor damage, removing healthy structure sacrifices more than it protects.

Crown Materials Compared

No material is best for every tooth. The ADA advises that a dentist will consider the tooth’s location, gum position, patient preference, how much of the tooth shows when smiling, shade, and function. The main options compare as follows.

Cleveland Clinic notes that all ceramic crowns mimic natural enamel most closely, that zirconia withstands heavier forces than other ceramic types, and that metal crowns last longest in terms of wear, with color as their main drawback. Lithium disilicate, a reinforced glass ceramic used for many tooth colored crowns, performed similarly to metal ceramic crowns in the survival research below. Your dentist should be able to name the planned material and explain why it suits your tooth.

The Procedure, Step by Step

Treatment starts with an examination and usually an X ray, to see the root, the bone, and any decay or infection that cannot be seen directly. Before you agree, you should hear why a crown is recommended rather than a filling or onlay, how much sound tooth will remain, what material is planned, how many visits are expected, and what the fee covers.

Visit one: preparation and a temporary crown

The ADA describes the standard sequence for a crown on a natural tooth:

1. The tooth and surrounding tissues are numbed with local anesthetic, so preparation should not be painful. Tell the dentist if you feel pain, because more anesthetic can be given.
2. Any decay and any old or failing filling material are removed.
3. The dentist prepares the tooth by removing its outer portion so the crown will fit. If more structure is needed, the core is built up, sometimes with a post in a root treated tooth.
4. An impression or a digital scan provides an exact model of the prepared tooth, the neighboring teeth, and the bite. The shade is matched to neighboring teeth.
5. A temporary crown protects the prepared tooth while the permanent crown is made, usually by a dental laboratory, in less than two weeks, according to the ADA.

Between visits: living with a temporary crown

A temporary crown is a short term cover, not the finished restoration. The ADA advises that the tooth may be sensitive to hot and cold while it is in place, and to avoid chewing gum and sticky foods, which can pull a temporary off. Chew on the other side where you can, and clean around it gently. If a temporary comes off or breaks, keep it, avoid chewing on the tooth, and contact the practice promptly, because the prepared tooth underneath is smaller and weaker than a normal tooth.

Visit two: fitting the permanent crown

The temporary is removed and the permanent crown is tried in. The dentist checks the fit at the margin, the contact with neighboring teeth, the bite, and the appearance, and adjusts where needed. An X ray may be taken to check the fit. When you and the dentist are satisfied, the crown is cemented in place, as the ADA describes. Speak up if the bite feels uneven or high, because adjustments are straightforward at this stage, and a crown taking too much force can become sore or chip.

Same day crowns

Some practices use computer aided design and manufacturing (CAD/CAM) to make a crown in one visit. Cleveland Clinic explains that the dentist takes digital impressions, designs the crown with software, and sends the design to an on site milling machine that cuts it from a solid block of ceramic, removing the need for a temporary and a second visit. The same source notes same day crowns are not for everyone.

What It Feels Like Afterward

Some sensitivity to hot or cold is common for a short period after fitting, with both the temporary and the permanent crown, and it usually settles. Your bite may feel slightly unfamiliar for a few days. Sensitivity that worsens rather than improves, pain on biting that does not ease, a bite that clearly feels high, or discomfort that keeps you awake is not part of the normal pattern. Contact the practice. A bite adjustment is a quick fix when caught early, and persistent pain can signal that the nerve, the fit, or the gum needs attention.

How Long Crowns Last: What the Evidence Shows

No crown is permanent, and lifespan figures vary because sources measure different things. Leeds Teaching Hospitals NHS Trust states that a properly cared for crown should normally last around 8 to 10 years, depending on checkups, cleaning technique, and diet. A systematic review by Sailer and colleagues, published in Dental Materials in 2015, pooled 67 studies covering more than 14,000 single crowns and estimated 5 year survival at 94.7 percent for metal ceramic crowns and 96.6 percent for crowns made from leucite or lithium disilicate reinforced glass ceramic, with zirconia based crowns in a similar range and older feldspathic ceramics lower. Survival means the crown was still in place at follow up. It does not mean nothing ever needed repair, because the same review recorded complications such as chipping of layered ceramic and loss of retention.

Read together, the evidence supports a practical expectation: many crowns serve well for a decade or more, some longer, and some fail sooner, especially where grinding, heavy bite forces, decay at the margin, or irregular care work against them. Fit, bite balance, the sound tooth underneath, and daily care matter at least as much as material. Treat any promise of an exact number of years with caution.

How to Care for a Crown

A crown itself cannot decay, because it is not natural tooth. The natural tooth underneath and the gum around it still can. Decay most often starts at the margin, where crown meets tooth, which is why daily cleaning at the gumline matters as much as for any other tooth. Our overview of crown, bridge, and filling aftercare collects the general aftercare pattern. The core routine, as the ADA and Leeds Teaching Hospitals NHS Trust describe it, is:

• Brush twice a day with fluoride toothpaste, and clean between your teeth daily, paying attention to the gumline around the crown. Ask your hygienist to show you the technique around a crown margin if unsure.
• Limit how often you consume sugar, which helps preserve both the crown and the natural teeth.
• Avoid chewing very hard objects such as ice, hard candy, or pencils. The ADA highlights this especially for tooth colored crowns, because hard chewing is a common cause of chipping.
• If you clench or grind your teeth, tell your dentist. Grinding can shorten a crown’s life, and a dentist may discuss a night guard.
• Keep regular checkups and professional cleanings, so the margin, gum, and bite can be checked and small problems found early.

Whitening needs a specific warning. The ADA’s MouthHealthy guidance notes that whitening will not work on caps, crowns, veneers, or fillings, because whitening agents act on natural teeth. If you plan both whitening and a new crown, discuss the order with your dentist, so the crown shade is matched to the color you intend to keep.

Problems That Can Happen

Most crowns give years of trouble free service, but problems do occur:

• Loosening or loss of the crown. Loss of retention is a recognized complication in the crown survival research. A loose crown leaves the prepared tooth exposed to bacteria and fracture. Keep a crown that comes off, store it somewhere safe and clean, and contact your dentist promptly. Do not glue it back with household adhesive, and do not chew on the exposed tooth meanwhile.
• Chipping. Layered porcelain on PFM and some ceramic crowns can chip, exposing the material beneath. A small chip may be polished or repaired; a large fracture usually means replacement. Only an examination can judge which applies.
• Decay under or beside the crown. Decay can develop in the natural tooth at the margin, beneath a crown that still looks sound from outside. Our article on decay under a crown explains how it happens and what signs to watch for. A bad taste, odor from one area, or food catching at the margin are all worth reporting.
• Sensitivity or pain. Brief sensitivity after fitting is common. Lingering pain, pain on biting, spontaneous aching, or swelling can point to a high bite, a problem with the nerve, or infection, and needs assessment rather than waiting.
• Gum problems around the crown. Persistent bleeding, redness, or soreness can reflect plaque at the margin, a margin sitting poorly against the gum, or gum disease. It should be checked rather than managed by brushing harder.
• Damage to the tooth underneath. The tooth under a crown can still fracture, and a root treated tooth can fail for reasons in the root rather than the crown. A failed crown therefore sometimes leads to further treatment, and occasionally to removal of the tooth.

Costs, in General Terms

Fees vary widely, and this guide deliberately gives no price figure, because a number quoted out of context would mislead more than it helps. Cost depends on the material, the tooth, laboratory work, local fees, and whether other treatment is needed first, such as a core build up, a post, root canal treatment, or gum treatment. Insurance treatment of crowns also varies by plan, including what share the plan pays and any waiting periods or annual limits. Before treatment begins, ask for a written estimate that separates the crown from additional procedures, names the material, and states what happens if the crown needs adjustment or remaking shortly after fitting. If cost is a barrier, say so, and ask whether a more conservative restoration would serve for now and what waiting would risk.

Alternatives to a Crown

A crown is one option on a ladder of restorations:

• A filling. For a smaller cavity or a tooth with strong remaining walls, a direct filling restores the tooth in one visit with far less removal of natural structure. Our article on how long a cavity filling lasts covers filling lifespan and replacement signs.
• An onlay or inlay. These laboratory made partial restorations fit within the chewing surface (inlay) or extend over one or more cusps (onlay), preserving more natural tooth than a full crown. A 2024 systematic review in the European Journal of Prosthodontics and Restorative Dentistry found survival results for full cuspal coverage onlays favorable in the short to medium term for root treated back teeth, which supports discussing an onlay when enough sound tooth remains.
• A veneer. For a front tooth where the problem is mainly appearance and the bite is not heavy, a veneer covers only the front surface and removes less structure. It does not protect a weakened tooth, so it is not a substitute where strength is the problem.
• Extraction and replacement, or no replacement. If a tooth cannot be restored reliably, removing it may be the realistic option, followed by a discussion of replacing it with an implant, a bridge, or a denture, or of leaving the gap. The honest comparison includes the cost and consequences of replacement, or of living with the gap.
• Monitoring, for early decay only. Where examination shows only early mineral loss, with no hole and no structural damage, a dentist may choose fluoride treatment and monitoring instead of a restoration. That does not apply to a cracked, broken, or heavily filled tooth.

When to Contact Your Dentist

Contact your dentist promptly if any of the following happen with a temporary or permanent crown:

• The crown feels loose, rocks, or comes off completely.
• The crown or the tooth chips, cracks, or breaks.
• Your bite feels high or uneven after the anesthetic wears off, or pain on biting persists.
• Sensitivity to hot or cold is worsening, or pain becomes spontaneous, throbbing, or keeps you awake.
• You notice swelling of the gum or face, a bad taste that keeps returning, or bleeding around the crown that does not settle.
• A temporary crown comes off or breaks while you are waiting for the permanent one.

Swelling with fever, difficulty swallowing, or difficulty opening the mouth needs urgent same day advice from a dentist or an urgent care service, because those signs can indicate a spreading infection. Keep any crown that comes out and take it with you. In some cases a sound crown on a sound tooth can be recemented, and the practice can only judge that by examining both.

Frequently Asked Questions

Does getting a crown hurt?

The tooth is numbed during preparation, so the procedure itself should not be painful, and you should tell the dentist if you feel pain so more anesthetic can be given. Some sensitivity to hot or cold is common afterward and usually settles over days to a few weeks. Pain that worsens, throbs, or disturbs sleep is a reason to contact the practice.

How many visits does a crown take?

Usually two. At the first visit the tooth is shaped, an impression or digital scan is taken, and a temporary crown is fitted. The permanent crown is fitted and cemented at the second visit, usually less than two weeks later, according to the ADA. Practices with in office CAD/CAM milling can sometimes finish in one visit.

Can a crowned tooth still get decay?

Yes. The crown material cannot decay, but the natural tooth at and below the margin can, and decay under a crown is a recognized cause of crown failure. Brushing with fluoride toothpaste, daily cleaning between the teeth, attention to the gumline, limiting frequent sugar, and regular checkups therefore remain essential.

Which crown material is best?

There is no single best material. All porcelain and ceramic crowns look most like natural enamel and suit visible teeth and people with metal sensitivity. Zirconia combines a tooth colored appearance with high strength. Porcelain fused to metal balances strength with appearance, though its porcelain can chip. Metal crowns, including gold, are the most wear resistant, but their color limits them mainly to back teeth. The right choice depends on the tooth, your bite, and your priorities.

How long will my crown last?

Many crowns last a decade or more, as the lifespan section above sets out: around 8 to 10 years is a normal expectation for a properly cared for crown, and pooled research found about 95 percent of single crowns still in place at 5 years.

What should I do if my crown falls out?

Keep the crown somewhere safe and clean, take it with you to the dentist, and contact the practice promptly. Do not glue it back with household adhesive, and avoid chewing on the exposed tooth, which is smaller and weaker than a normal tooth. A dentist may be able to recement a crown if both crown and tooth are sound, or may find decay or fracture that means a new crown is needed.

Will I need a root canal with a crown?

Not routinely. Many crowned teeth have not had root canal treatment and do not need it. A crown is often placed after root canal treatment to protect the restored tooth, especially a back tooth, but the two are separate decisions. Preparing a tooth can occasionally irritate the nerve, and lingering or worsening pain after fitting is a sign to report.

Sources & references

• American Dental Association, MouthHealthy, Crowns. https://www.mouthhealthy.org/all-topics-a-z/crowns
• American Dental Association, Patient Education, Crowns (ADA crown brochure: what a crown is, materials, the two visit placement sequence, temporary crown guidance, and care). https://129ec0bc-c1cc-dedd-6efe-1328d8c2788c.filesusr.com/ugd/163497_6d238e304cca423aa1759836b90e6425.pdf
• Leeds Teaching Hospitals NHS Trust, Crowns (patient information: reasons for a crown, materials, posts, suitability, alternatives, two visit treatment, lifespan, and care). https://www.leedsth.nhs.uk/patients/resources/crowns/
• Cleveland Clinic, Dental Crowns: Types, Procedure and Care. https://my.clevelandclinic.org/health/treatments/10923-dental-crowns
• Sailer I, Makarov NA, Thoma DS, Zwahlen M, Pjetursson BE. All-ceramic or metal-ceramic tooth-supported fixed dental prostheses? A systematic review of the survival and complication rates. Part I: Single crowns. Dental Materials, 2015. University repository record: https://iris.uniroma1.it/handle/11573/1665987
• Lane et al. Survival and Success Rates of Endodontically Treated Teeth Restored with Full Veneer Crowns or Full Cuspal Coverage Onlays: A Systematic Review. European Journal of Prosthodontics and Restorative Dentistry, 2024. https://www.ejprd.org/view.php?article_id=1145&journal_id=145
• Mannocci F, Cowie J. Restoration of endodontically treated teeth. British Dental Journal (review summarizing systematic review evidence on crown coverage and survival of root filled teeth). https://d.docksci.com/restoration-of-endodontically-treated-teeth_5af3676ad64ab2c22bbf7eda.html