Crowns & Bridges

Introduction

If you have been told that a tooth needs a crown, or that a gap in your mouth could be closed with a bridge, you are looking at one of the most established areas of restorative dentistry. Crowns and bridges have been used for decades to rebuild broken teeth, protect weakened teeth after root canal treatment, and replace missing teeth without the need for a removable denture.

This guide is written for people who already know that some form of restorative work is needed, and who want to understand what is involved before going ahead. It explains what crowns and bridges are, the different types and materials available, how the procedure unfolds across appointments, what recovery feels like, the risks to be aware of, and how to care for the restorations so they last as long as possible.

The decisions involved — which type of crown, which bridge design, which material, whether implants might be a better long-term answer — are made together with your dentist after examining the tooth, the bite, and the surrounding gum and bone. The aim of this article is to help you walk into that conversation with a clear picture of what is being discussed.

What Are Crowns and Bridges?

Crowns and bridges are fixed dental restorations. “Fixed” means they are cemented or bonded onto teeth or implants and stay in place — you do not take them out at night the way you would a denture.

What a Dental Crown Is

A dental crown is a custom-made cap that covers the entire visible part of a tooth, from the gum line upward. Dentists sometimes call it a “cap.” It is shaped, sized, and coloured to look like a natural tooth and is cemented onto the prepared tooth underneath.

The purpose of a crown is to restore the strength, shape, and appearance of a tooth that has been damaged, weakened, or heavily filled. Once in place, the crown takes the chewing forces that the natural tooth structure can no longer handle on its own.

What a Dental Bridge Is

A dental bridge replaces one or more missing teeth by using the teeth on either side of the gap as anchors. The replacement tooth (called a pontic) is fused between two crowns, which are cemented onto the neighbouring teeth (called abutments). The whole structure is one piece.

Bridges can also be supported by dental implants rather than natural teeth. In that case, the implants act as the anchors instead of preparing adjacent teeth.

How They Work Together

Crowns and bridges are often discussed together because a bridge is, in effect, two or more crowns joined to one or more artificial teeth. The materials, the laboratory process, and the appointments are very similar. Many patients receive a combination of restorations during the same treatment plan — a crown on one tooth, a bridge across a gap on another part of the mouth.

Why Crowns and Bridges Are Used

Dentists turn to crowns and bridges in a range of situations. The common thread is that the tooth or the gap cannot be managed adequately with a simple filling.

Reasons a Crown May Be Used

• A tooth has a large area of decay or an old filling so large that little natural tooth is left to hold a new filling
• A tooth is cracked or broken and needs to be held together to prevent further fracture
• A tooth has had root canal treatment and is now more brittle, putting it at risk of splitting
• A tooth is severely worn down by grinding, acid erosion, or age
• A tooth is misshapen or discoloured in a way that fillings or whitening cannot address
• A tooth is being used as an anchor (abutment) for a bridge
• A dental implant needs a crown placed on top of it to replace a missing tooth

Reasons a Bridge May Be Used

• One or more teeth are missing and the gap is affecting chewing, speech, or appearance
• The teeth on either side of a gap are drifting or tilting into the empty space
• The opposing tooth (above or below the gap) is starting to over-erupt because there is nothing to bite against
• A removable denture is not the preferred option and a fixed replacement is sought
• Implants are not possible due to limited bone, medical reasons, or personal choice

Leaving a missing tooth unreplaced is not always a problem clinically, but over time it can change how the bite distributes force across the remaining teeth. A bridge is one way of closing that gap and keeping the bite stable.

Who Is a Candidate?

Whether crowns and bridges are suitable depends less on age and more on the condition of the surrounding teeth, gums, and bone.

For a crown, a dentist will check that:

• Enough healthy tooth structure remains to support a crown after preparation
• The tooth root is sound, or has been successfully treated with a root canal
• The gums around the tooth are healthy
• The bite forces on that tooth can be managed by the chosen material

For a bridge, the additional checks include:

• The teeth on either side of the gap are strong enough to act as anchors
• The abutment teeth are healthy or can be made healthy before bridge work
• The gum and bone supporting the abutments are stable
• The length of the gap is suitable for a bridge (very long gaps may not be ideal)
• Gum disease, if present, has been brought under control

People who grind their teeth heavily, who have advanced gum disease, or who have very limited remaining tooth structure may need additional treatment before a crown or bridge is placed — or may be guided toward a different option such as an implant.

Alternatives to Crowns and Bridges

Crowns and bridges are not the only way to address damaged or missing teeth. The alternatives depend on what is being treated.

Alternatives to a Crown

• Large fillings or inlays/onlays: When enough natural tooth remains, a large filling or a laboratory-made inlay or onlay may rebuild the tooth without covering it entirely. Onlays cover the chewing surface but not the full tooth.
• Veneers: For front teeth where the concern is mainly appearance rather than structural weakness, a thin veneer bonded to the front surface may be considered.
• Extraction and replacement: If a tooth is too damaged to save, removing it and replacing it with an implant or a bridge is sometimes a better long-term answer than trying to crown a tooth with a poor prognosis.

Alternatives to a Bridge

• Dental implants: An implant replaces the missing tooth root with a titanium post placed in the jawbone, topped with a crown. Implants do not require cutting down the neighbouring teeth and are now widely used as a long-term option for single missing teeth.
• Removable partial dentures: A removable appliance that clips onto remaining teeth. Less expensive in the short term and less invasive to neighbouring teeth, but less stable and less comfortable than fixed options for many people.
• Leaving the gap: In some situations — for example, a back tooth where the bite is stable and the appearance is not affected — a dentist may discuss leaving the space alone and monitoring it.

Whether a bridge, an implant, or another option is the better fit is one of the main decisions in a restorative plan. Implants generally avoid putting load on neighbouring teeth and avoid the need to prepare them, but they involve surgery, a healing period, and adequate bone. Bridges avoid surgery and are completed faster, but rely on the neighbouring teeth being healthy enough to take the load. Your dentist will explain how these trade-offs apply to your specific mouth.

Types of Crowns and Bridges

Crowns and bridges come in several designs and materials. The choice affects strength, appearance, longevity, and how much of the natural tooth needs to be prepared.

Types of Crowns by Material

All-ceramic and all-porcelain crowns. Made entirely from tooth-coloured ceramic. They give the most natural appearance and are commonly used for front teeth where appearance is a priority. Modern ceramics are strong, but very heavy bite forces can chip them in some patients.

Zirconia crowns. Made from zirconium dioxide, a very strong ceramic. Zirconia crowns are popular because they combine high strength with a tooth-coloured appearance. They are used on both front and back teeth and are particularly useful for patients with heavier bites.

Porcelain-fused-to-metal (PFM) crowns. Have a metal inner shell for strength and a porcelain outer layer for appearance. They have been used for decades and remain a reliable option, although a thin dark line at the gum can sometimes become visible over time as gums recede.

Metal crowns (gold or other alloys). Very strong and gentle on opposing teeth, with a long track record of durability. The metal colour means they are usually placed on back teeth where they are less visible.

Resin or composite crowns. Less expensive but generally less durable than ceramic or metal crowns. Sometimes used as a temporary or interim restoration.

Types of Bridges by Design

Traditional bridges. The most common design. The artificial tooth is held in place by crowns on the teeth on either side of the gap. Used when there are healthy teeth on both sides.

Cantilever bridges. The artificial tooth is supported on only one side rather than both. Used less often today because the single anchor takes all the chewing load, but they can be appropriate in specific situations.

Maryland (resin-bonded) bridges. The artificial tooth is held in place by thin wings of metal or ceramic bonded to the back of the neighbouring teeth. Because the neighbouring teeth are barely prepared, this design preserves more natural tooth. It is often used for front teeth, especially in younger patients.

Implant-supported bridges. Anchored to dental implants rather than natural teeth. Used when several teeth in a row are missing, or when the teeth next to the gap are not suitable as anchors. The neighbouring natural teeth are not cut down.

Preparing for Crowns and Bridges

Before crown or bridge work begins, the mouth needs to be in a suitable condition. The aim is to make sure that what is being built on is healthy and will support the restoration over the long term.

Initial Examination and Planning

At the planning visit, the dentist will examine the teeth and gums, take X-rays, and may take photographs and digital scans. The bite is checked, including how the upper and lower teeth meet and whether there are signs of grinding. The choice of material, the design of the bridge if relevant, and the number of appointments are discussed at this stage.

Treating Any Existing Problems First

Before placing a crown or bridge, dentists typically address any active dental problems, which may include:

• Treating tooth decay in the tooth being restored or in neighbouring teeth
• Treating gum disease so the gums around the restoration are healthy and stable
• Completing root canal treatment if the tooth's nerve is affected
• Placing a build-up or post if too little tooth structure is left to support a crown

Sharing Your Medical History

It is helpful to share any medical conditions, allergies, and current medicines with your dentist. Some medical conditions (for example, certain bone conditions or bleeding disorders) and some medicines affect dental treatment planning. Mention if you have a known allergy to any metals.

Habits to Discuss

Tell your dentist if you grind or clench your teeth, especially at night. Grinding puts heavy forces on crowns and bridges and can shorten their lifespan or cause chipping. Smoking and high-sugar diets affect the long-term health of the gums and remaining teeth that support the restoration.

What Happens During the Procedure

Crown and bridge treatment usually takes place across two or more appointments. Some dental practices use in-house digital scanning and milling machines that allow a crown to be made in a single visit, but the traditional two-visit pattern is still common.

Appointment 1: Tooth Preparation and Impressions

The tooth (or teeth, for a bridge) is numbed with local anaesthetic. The dentist then carefully shapes the tooth, removing a controlled amount of the outer surface so that the crown has space to fit over it. For a bridge, both anchor teeth are shaped in this way.

Once the tooth is prepared, an impression is taken. This is done either with a soft moulding material that sets in the mouth, or with a digital scanner that records the shape of the teeth electronically. The impression captures the prepared tooth, the neighbouring teeth, and the opposing bite so that the laboratory can make a restoration that fits accurately.

A temporary crown or bridge made of plastic or resin is then placed over the prepared tooth. The temporary protects the tooth, keeps the gum in shape, and lets you eat and speak normally while the permanent restoration is being made.

Between Appointments: The Laboratory Stage

You may be asked to avoid sticky foods (which can pull off the temporary), very hard foods (which can crack it), and flossing in a way that could dislodge it.

Appointment 2: Fitting and Cementing

At the second visit, the temporary is removed and the permanent crown or bridge is tried in. The dentist checks the fit, the contact with the neighbouring teeth, the colour, and how the restoration meets the opposing teeth when you bite.

Small adjustments are common at this stage and are normal. Once everything is right, the restoration is cemented or bonded into place. Excess cement is cleaned away and the bite is checked one more time.

Same-Day Crowns

Some clinics offer same-day crowns made using a digital scanner and a small in-house milling machine. The tooth is prepared, scanned, and the crown is milled from a ceramic block while you wait. This avoids the temporary stage and reduces the number of visits. Not all crowns are suited to this approach, and the materials available may be more limited than at a full laboratory.

How It Feels

The preparation appointment is done under local anaesthetic, so you should not feel pain during the tooth shaping. You may feel pressure, vibration, and the sound of the dental handpiece. The fitting appointment is usually shorter and most people do not need anaesthetic for it, although some dentists offer it if the gum is sensitive.

Recovery and Adjusting to Your New Restoration

Crown and bridge treatment does not require a long recovery in the way that surgery does, but there is an adjustment period.

The First Few Days

After tooth preparation, the gum around the tooth may be tender for a day or two. The tooth itself may feel sensitive to cold, hot, or sweet things while the temporary is in place, because the protective outer enamel layer has been reduced. This usually settles once the permanent crown is fitted.

After the permanent crown or bridge is cemented, mild tenderness or a slight sense of pressure is common for a few days. The bite may feel slightly different at first — this often settles as you get used to the new shape, but if it feels persistently “high” or uncomfortable, a small adjustment by your dentist can correct it.

Eating and Drinking

While the temporary is in place, it helps to avoid very sticky foods (toffee, chewing gum), very hard foods (ice, hard nuts), and chewing directly on the temporary side if possible.

After the permanent restoration is fitted, you can usually return to normal eating quickly. It is sensible to ease back into chewing on that side for the first day or two, particularly if you had a bridge placed.

Sensitivity

Some tooth sensitivity in the days after fitting is normal. If sensitivity is severe, lasts more than a couple of weeks, or is triggered by biting rather than temperature, let your dentist know. Persistent biting pain can mean the bite needs adjusting.

Risks and Possible Complications

Crown and bridge work has a long safety record, but as with any dental procedure there are risks to be aware of.

Short-Term Issues

• Sensitivity: Temporary sensitivity to hot, cold, or pressure is common and usually settles within days to a few weeks.
• Bite discomfort: The new restoration may feel slightly high; a small adjustment usually fixes this.
• Gum irritation: The gum around a new crown or bridge may be tender or slightly inflamed at first.
• Temporary loosening: The temporary restoration can come off, especially if you eat sticky foods. It can usually be re-cemented quickly.

Longer-Term Issues

• Nerve involvement: Preparing a tooth for a crown sometimes irritates the nerve. In a small number of cases, the tooth later needs root canal treatment.
• Decay at the margin: Where the crown meets the natural tooth, plaque can build up. If hygiene is not maintained, decay can develop at this junction.
• Gum recession: Over time, the gum line can recede slightly, sometimes exposing the edge of the crown.
• Chipping or fracture: Ceramic crowns and bridges can chip, especially under heavy bite forces or in grinders.
• Loss of the restoration: A crown or bridge can come loose if the cement fails or if the underlying tooth structure weakens.
• Failure of an abutment tooth: For a bridge, if one of the anchor teeth develops decay, gum disease, or fracture, the whole bridge may need to be remade.

Allergic and Sensitivity Reactions

Allergic reactions to crown and bridge materials are uncommon. People with known metal sensitivities can usually be matched to non-metal options such as all-ceramic or zirconia restorations.

Caring for Your Crowns and Bridges

How long a crown or bridge lasts depends heavily on day-to-day care of the mouth. The restoration itself does not decay, but the tooth structure underneath and the gum around it remain vulnerable.

Daily Cleaning

• Brush twice a day with a fluoride toothpaste, paying attention to the gum line around the crown
• Clean between the teeth daily with floss or interdental brushes
• For bridges, use a floss threader, super-floss, or a small interdental brush to clean under the artificial tooth — this area cannot be cleaned with regular floss
• A water flosser can be a useful addition, especially around bridges

Diet and Habits

• Avoid chewing very hard objects (ice, pen lids, hard nuts, popcorn kernels) which can chip ceramic restorations
• Avoid sticky foods that can pull at a bridge or weaken cement over time
• Reduce frequent sugary or acidic snacking, which raises the risk of decay at the crown margin
• Do not use your teeth as tools to open packets or bite threads

Protecting Against Grinding

If you grind or clench your teeth, particularly at night, a custom night guard can protect crowns and bridges from heavy forces and chipping. Your dentist may suggest one if there are signs of wear.

Regular Check-Ups

Routine dental check-ups and cleanings allow your dentist to:

• Check the fit and condition of the restoration
• Look for early signs of decay at the margins
• Monitor the health of the gums and supporting bone
• Clean areas that are harder to reach at home, including under and around bridges

For most people, a check-up every six months is appropriate, although your dentist may suggest a different schedule based on your individual risk.

How Long Crowns and Bridges Last

The lifespan of a crown or bridge varies widely from person to person. With good oral hygiene, a stable bite, and regular dental care, many last for 10 to 15 years or longer. Some last considerably longer; others need replacement sooner.

Factors that influence how long a restoration lasts include:

• The material used and the quality of the laboratory work
• The position of the restoration in the mouth and the bite forces it handles
• How well the underlying tooth and gum are maintained
• Whether the patient grinds or clenches teeth
• Smoking and overall oral health
• For bridges, the long-term health of the anchor teeth

When a crown or bridge does need replacement, the most common reasons are decay at the margin, fracture, loss of cementation, or a problem with one of the supporting teeth. Replacing a restoration is usually straightforward, although in some cases additional treatment of the underlying tooth is also needed.

Crowns in Children

Crowns for children are different from those used in adults, and they are common enough to be worth a brief mention for parents reading this article on behalf of a child.

In children, crowns are most often placed on baby (primary) teeth that have been heavily affected by decay or that have had a pulp treatment. The crowns used are usually prefabricated — commonly stainless steel crowns for back teeth, and tooth-coloured crowns for front teeth. They are designed to stay in place until the baby tooth naturally falls out and the adult tooth comes through.

Bridges are rarely used in children, because the jaw is still growing and a fixed bridge would not adapt to that growth. When a child loses a permanent tooth, dentists often use a removable space maintainer until growth is complete, and then consider a long-term solution such as an implant once the jaw has finished developing.

Decisions about restorative work in children are made by paediatric dentists or general dentists with experience in treating children, with input from the parents.

Frequently Asked Questions

Will the procedure hurt?

Tooth preparation is done under local anaesthetic, so you should not feel pain during the appointment. You may feel pressure or vibration. Mild tenderness for a day or two afterwards is normal.

Why does my tooth need a crown instead of just a filling?

When too much of the natural tooth has been lost — from a large cavity, an old filling, a fracture, or root canal treatment — a filling alone may not have enough structure to bond to, and the remaining tooth may not be strong enough to handle chewing without splitting. A crown wraps around what is left and protects it.

Can a crowned tooth still get decay?

The crown itself does not decay, but the natural tooth underneath, particularly where it meets the crown at the gum line, can. This is why daily cleaning around the crown and regular check-ups matter.

How long does each appointment take?

The preparation appointment usually takes about an hour, sometimes longer for a bridge. The fitting appointment is generally shorter, often 30 to 45 minutes.

Can I eat normally with a temporary crown?

Mostly, yes. It helps to avoid very sticky foods, very hard foods, and chewing directly on the temporary side. The temporary is meant to last a week or two, not indefinitely.

Is a bridge or an implant the better choice for a missing tooth?

Both are well-established options and each has trade-offs. Implants do not involve preparing the neighbouring teeth and have a long track record, but they need adequate bone, involve a surgical step, and require healing time. Bridges are completed faster and avoid surgery, but the neighbouring teeth need to be shaped to act as anchors. The choice depends on the specific tooth, the condition of the surrounding teeth and bone, and the patient's preferences, and is decided in discussion with your dentist.

Can a crown or bridge be whitened?

No. Ceramic and metal restorations do not respond to tooth-whitening products. If you are planning to whiten your natural teeth, it is usually done before crown or bridge work so the restoration can be matched to the lighter shade.

What if my crown or bridge comes off?

If a crown or bridge becomes loose or falls out, keep the restoration, avoid chewing on that side, and contact your dentist. In many cases the same restoration can be re-cemented if the underlying tooth is undamaged. Avoid trying to glue it back on yourself, as this can damage both the tooth and the restoration.

Can I have an MRI or other medical scans with a crown?

Most modern crowns and bridges, including ceramic, zirconia, and most metal alloys, are compatible with MRI and other medical imaging. Let the radiology team know about any dental work; they may make minor adjustments to the scan, but it is rarely a problem.

Conclusion

Crowns and bridges are a well-established part of restorative dentistry. A crown rebuilds and protects a tooth that is too damaged or weakened for a filling alone. A bridge closes a gap left by one or more missing teeth, restoring the bite and preventing surrounding teeth from drifting. The materials and designs available today allow restorations that are strong, natural in appearance, and long-lasting when supported by good oral care.

The decisions that go into a crown or bridge plan — which material, which design, whether an implant or another option may serve better in the long term — are made together with your dentist after looking carefully at the tooth, the bite, and the surrounding gum and bone. Understanding what is involved before, during, and after treatment helps you take part in those decisions with confidence and care for your restoration well once it is in place.