When a tooth is damaged or decayed, one of the most common questions patients ask is whether they need a simple filling or a full crown. Both treatments are designed to restore a tooth's function and protect it from further damage — but they're used in very different situations.
In this guide, we'll explain the difference between a filling and a crown, when each option is recommended, and what factors dentists consider before choosing one over the other. We'll also walk through the benefits, limitations, and long-term expectations of each treatment so you can feel confident and informed before your appointment. While only a dentist can make a final diagnosis, understanding these basics helps you know what to expect and why a particular treatment may be recommended.
What Is a Dental Filling?
A filling is used to repair a small to moderate area of decay or damage in a tooth.
How Fillings Work
The decayed portion of the tooth is removed and replaced with a restorative material (usually composite resin or amalgam) to restore the tooth's shape and function.
When a Filling Is Typically Used
- Small cavities
- Minor cracks or chips
- Early-stage tooth decay
- Replacement of old fillings
Fillings preserve most of your natural tooth structure and are a minimally invasive solution.
What Is a Dental Crown?
A crown is a custom-made cap that covers the entire visible portion of a tooth.
How Crowns Work
The tooth is reshaped, and a crown is placed over it to restore strength, shape, and appearance.
When a Crown Is Typically Used
- Large cavities
- Cracked or weakened teeth
- After root canal treatment
- Severely worn or broken teeth
Crowns provide full coverage and protection when a tooth is structurally compromised.
Key Differences Between a Filling and a Crown
Amount of Tooth Damage
Fillings are used when damage is minimal. Crowns are used when the tooth is significantly weakened.
Strength and Protection
Crowns offer much more structural support than fillings.
Longevity
Crowns generally last longer than fillings because they protect the entire tooth.
How Dentists Decide Between a Filling and a Crown
Size of the Cavity
If more than about half the tooth is damaged, a crown is often recommended.
Tooth Location
Back teeth experience more chewing pressure and may need crowns sooner than front teeth.
Tooth Integrity
Cracks, fractures, or prior root canal treatment usually require a crown.
Pros and Cons of Each Option
Fillings — Pros and Cons
Pros:
- Less invasive
- Lower cost
- Preserves natural tooth
Cons:
- Less durable for large restorations
- May need replacement sooner
Crowns — Pros and Cons
Pros:
- Strong and long-lasting
- Protects weakened teeth
- Restores full function
Cons:
- More invasive
- Higher cost
- Requires more tooth reshaping
People Also Ask — Filling vs Crown FAQs
Can a filling be replaced with a crown later?
Yes — if decay worsens or the tooth weakens over time, a crown may be recommended.
Does getting a crown hurt?
No — the procedure is done with local anaesthetic and is generally comfortable.
Are crowns better than fillings?
Not necessarily — each serves a different purpose depending on the tooth's condition.
Can a crown fail?
Crowns can wear, chip, or loosen over time, but they typically last 10–15 years or more with proper care.
Unsure Whether You Need a Filling or a Crown?
If you're experiencing tooth pain, sensitivity, or visible damage, a dental exam is the best way to know what's needed. We'll help you choose the most appropriate treatment for your tooth and long-term oral health 😊