Dental Crowns vs Fillings: Which Is Right for You

If your dentist tells you a tooth needs repair, you might hear two common options: a filling or a crown. Both restore damaged teeth, but they serve very different purposes.

The simplest way to think about it: a filling patches a small problem, while a crown wraps and protects the whole tooth when the damage is more significant.

Here is a breakdown of how they compare, so you understand the reasoning behind the recommendation.

What a Filling Does

A filling is used when a tooth has a small to moderate area of decay. The dentist removes the damaged part (usually decay caused by a cavity) and fills the space with a restorative material.

Materials used. Modern fillings are typically made of composite resin — a tooth-coloured material that bonds directly to the tooth. In some cases, glass ionomer or amalgam (silver) fillings may be used depending on the location and function of the tooth.

The process. The dentist numbs the area, removes the decay, cleans the cavity, and places the filling material in layers. Each layer is hardened with a curing light. The whole thing is usually done in a single visit, often in under an hour.

When it is the right choice. Fillings work well when the tooth structure is mostly intact. If the decay is contained and the remaining walls of the tooth are strong enough to support chewing forces, a filling is sufficient.

Limitations. A filling only replaces the missing tooth structure — it does not reinforce the rest of the tooth. If the tooth is too weak, the remaining enamel can crack under pressure. Fillings also do not protect the tooth from future fracture on other surfaces.

What a Crown Does

A crown is a custom-made cap that fits over the entire visible part of the tooth, from the gum line up. It encases the tooth completely, providing strength and protection.

Materials used. Crowns can be made from various materials — all-porcelain (ceramic), porcelain fused to metal, or full metal (gold or other alloys). All-ceramic crowns are the most popular choice for visible teeth because they match the natural tooth colour closely.

The process. A crown usually requires two visits. At the first visit, the dentist reshapes the tooth to make room for the crown, takes an impression or digital scan, and places a temporary crown. At the second visit, the permanent crown is fitted and cemented in place.

When it is the right choice. Crowns are used when the tooth has lost a large amount of structure — from a large cavity, a crack running through the tooth, or a fracture. They are also used after root canal treatment, where the tooth becomes more brittle and needs protection.

Advantages. A crown distributes chewing forces evenly across the tooth, preventing further cracking. It seals the entire tooth surface, reducing the chance of future decay at the margins. And because it covers everything, it can also improve the appearance of a misshapen or discoloured tooth.

How to Compare Them Side by Side

Factor	Filling	Crown
Tooth structure removed	Minimal — only decay	More — reshaped to fit cap
Visits required	Usually one	Usually two
Typical lifespan	5 to 7 years	10 to 15 years
Best for	Small to moderate decay	Large cavities, cracks, post-root canal
Strength	Restores locally	Reinforces entire tooth
Aesthetic match	Good for small areas	Excellent — covers whole tooth

This table simplifies things, but individual cases vary. A dentist will assess the specific condition of your tooth before recommending one over the other.

What the Dentist Considers When Recommending

Several factors go into the decision.

Size of the decay or damage. This is the main factor. If a filling would be over half the width of the tooth, a crown is usually a better choice because a large filling leaves too little natural tooth to hold everything together.

Location of the tooth. Molars take more chewing force than front teeth. A large filling on a molar is more likely to crack over time, so crowns are more common on back teeth when the damage is significant.

Whether the tooth has had root canal treatment. Root canal treatment removes the nerve and blood supply from the tooth, which can leave it more brittle over time. For many back teeth that have had root canal treatment, a crown may be one of the options discussed to help provide additional protection.

Existing cracks. If a tooth has a visible crack, a filling may not be enough on its own. In some situations, a crown may help support the tooth and reduce the risk of the crack worsening, depending on how far the crack extends.

Your oral habits. Grinding or clenching puts extra force on teeth. A dentist may recommend a crown over a filling for someone who grinds, just for the extra durability.

These factors are weighed together, not in isolation. That is why two people with apparently similar cavities might receive different recommendations.

What About the Experience?

Both procedures are done with local anaesthesia, so you should not feel pain during either one.

For a filling: the sensation is mostly vibration and pressure from the drilling. The appointment is shorter, and you go home the same day with the tooth fully restored.

For a crown: the first visit takes longer because the tooth needs more preparation. You will wear a temporary crown for a week or two while the permanent one is made. The temporary crown can feel a little bulky or odd at first, but most people adjust quickly. The second visit is short — just removal of the temporary, fitting, and cementing the permanent crown.

After either procedure, some sensitivity to temperature is normal for a few days. This usually settles on its own. Crowns may feel slightly different in the bite for the first day or two, which can be adjusted by the dentist if needed.

Cost Considerations (General Factors)

Pricing varies widely depending on the material chosen, the location of the tooth, and the complexity of the case. Here is what generally applies.

Fillings are the less expensive option because they require less material, less lab work, and fewer appointments. The cost depends mainly on the size of the filling and the material used.

Crowns involve more steps — tooth preparation, impression taking or digital scanning, temporary crown fabrication, and lab work for the permanent crown. The material chosen for the crown also significantly affects the overall cost.

It is worth noting that a crown that lasts 12 years can be more cost-effective over time than a larger filling that needs replacement after 5 years. Your dentist can help you think through the long-term value, not just the upfront cost.

Making the Decision

If your dentist recommends a crown and you were expecting a filling, it is fair to ask why. A good dentist will explain their reasoning — the size of the damage, the risk of fracture, the expected lifespan.

The reverse also happens: sometimes patients ask for a crown when a filling would be sufficient, thinking it is a stronger option. But removing healthy tooth structure unnecessarily is often avoided when a simpler restoration can support the tooth predictably.

For anyone considering options for restoring a damaged tooth, talking through the specifics with a restorative dental provider can help clarify the next step. Every tooth is different, and the right choice depends on your individual situation, not a general rule.