Crowns and bridges both restore teeth, but they are not the same
Patients often hear the words “crown” and “bridge” during dental appointments, but many are not sure what they mean. Both are common restorative treatments, and both can improve function and appearance. However, they solve different problems.
A crown is usually used to protect or rebuild a damaged tooth. A bridge is used to replace one or more missing teeth.
The NHS describes dental treatments including crowns, bridges, dentures, fillings, veneers, whitening and implants, with crowns and bridges being part of restorative dentistry options.
What is a dental crown?
A dental crown is a cover or cap placed over a tooth. It is designed to restore the tooth’s shape, strength, appearance and function. Crowns are commonly recommended when a tooth is too damaged for a normal filling.
A crown may be used for a tooth that is cracked, heavily filled, badly worn, weakened, root-treated, broken or cosmetically compromised. It can also be placed on top of a dental implant.
The crown fits over the prepared tooth and is cemented or bonded into place. Once fitted, it should feel comfortable and function like part of your bite.
When might you need a crown?
You may need a crown if a tooth has lost a lot of structure. Large fillings can weaken teeth over time. If there is not enough strong tooth left to support another filling, a crown may be a better long-term option.
Crowns are also often recommended after root canal treatment, especially on back teeth. Root-treated teeth can become more brittle and may need protection from biting forces.
Cracked teeth may also need crowns. A crown can help hold the tooth together and reduce the risk of further fracture, depending on the type and depth of the crack.
What is a dental bridge?
A dental bridge replaces a missing tooth or teeth. It literally “bridges” the gap. A traditional bridge uses the teeth on either side of the gap as supports. These supporting teeth are prepared for crowns, and the replacement tooth is attached between them.
A bridge is fixed in place. Unlike a denture, it is not removed daily. It can improve chewing, appearance and speech, and it can help stop nearby teeth from drifting into the gap.
When might you need a bridge?
A bridge may be suitable if you have one or more missing teeth and the neighbouring teeth are strong enough to support it. It may be especially practical if those neighbouring teeth already need crowns.
For example, if a patient is missing one tooth and the teeth on both sides are heavily filled or damaged, a bridge may solve two problems: restoring the supporting teeth and replacing the missing tooth.
However, if the neighbouring teeth are perfectly healthy, a dental implant may sometimes be considered because it can replace the missing tooth without preparing those healthy teeth.
Crowns protect teeth; bridges replace teeth
The easiest way to remember the difference is this:
A crown restores an existing tooth.
A bridge replaces a missing tooth by attaching to neighbouring teeth.
Sometimes crowns and bridges work together. A bridge uses crowns on the supporting teeth, with a replacement tooth attached between them.
How long do crowns and bridges last?
Crowns and bridges can last many years, but they are not permanent forever. Their lifespan depends on oral hygiene, bite forces, grinding, diet, gum health, material, fit and maintenance.
Decay can still happen around the edges of crowns and bridges. Gums can still become inflamed. Supporting teeth can still develop problems. This is why regular check-ups are important.
A crown or bridge is not a replacement for daily care. It needs careful brushing and cleaning around the edges.
Cleaning around crowns
A crown should be brushed like a natural tooth. Pay close attention to the gumline, where plaque can collect. If plaque sits around the crown margin, the gum may become inflamed and decay can develop on the natural tooth underneath.
Flossing or interdental cleaning is still important. Your dentist can show you the best way to clean around your specific crown.
Cleaning under bridges
Bridge cleaning requires extra attention. Because the replacement tooth is attached to the supporting crowns, normal floss cannot pass straight down between all areas. Special floss, floss threaders, interdental brushes or water flossers may be recommended.
Cleaning under the bridge is essential. Food and plaque can collect underneath, causing bad breath, gum inflammation or decay around the supporting teeth.
Crowns, bridges and appearance
Modern crowns and bridges can look natural. The shade, shape and size are chosen to blend with the rest of the smile. For front teeth, appearance is especially important. For back teeth, strength and bite function may be the main priorities.
Your dentist will consider the position of the tooth, smile line, bite forces and material options before recommending a crown or bridge.
Crown or bridge: which one do I need?
If your tooth is still present but damaged, you may need a crown. If the tooth is missing, you may need a bridge, implant or denture.
The correct option depends on the condition of the teeth, gums, bone, bite and budget. A dental examination is necessary before deciding.
What if I delay treatment?
Delaying a crown can allow a weakened tooth to crack further. In some cases, a tooth that could have been saved with a crown may eventually need extraction.
Delaying replacement of a missing tooth can allow teeth to drift, create bite problems, affect chewing, and make future treatment more complicated.
This does not mean every crown or bridge is urgent, but it does mean treatment should be planned rather than ignored.
A clear treatment plan helps
Patients often feel overwhelmed when they hear they need crowns, bridges or other dental work. A clear treatment plan helps break things down. Your dentist can explain which teeth need urgent attention, which options are available, and what can be phased over time.