Crown vs Filling: What Is the Difference?

A filling repairs part of a tooth, often where a cavity has formed. One common material is tooth-colored composite resin, which the ADA describes as durable and resistant to fracture in small to mid-size fillings. Composite can be used on front or back teeth and is chosen by many people for its natural look.

A crown works differently. The ADA describes it as a cap that covers the tooth to restore its normal shape and size, which can make the tooth stronger and improve its appearance. In simple terms, a filling replaces a missing piece inside the tooth, while a crown surrounds what is left of the tooth from the outside.

The most common reason people hear the word crown instead of filling is the size of the damage. The ADA notes that a crown can support a tooth with a large filling when there is not enough tooth left. The page lists other uses too, and your dentist can tell you which applies to your tooth after looking at it and at your X-rays.

• Too little natural tooth remains to hold a large filling
• A weak tooth needs protection from breaking
• A tooth is already broken and needs to be restored
• A tooth is discolored or badly shaped
• A bridge needs to be anchored, or a dental implant needs to be covered

Composite fillings are used more often than amalgam or gold today, largely for cosmetic reasons, according to the ADA. They have trade-offs worth knowing before your appointment. They cost more than amalgam and some insurance plans do not cover them. Placement takes longer than a metal filling because the tooth has to be kept clean and dry while the cavity is filled.

Durability is the other trade-off. The ADA notes that some studies suggest composite fillings wear faster than amalgam and may need replacing more often, and that no dental filling lasts forever. How long any filling or crown lasts depends on the tooth, your bite and your care, so ask your dentist what to expect for the specific tooth.

A filling quote and a crown quote are hard to compare directly, because the two treatments do different jobs and may not be expected to last the same time. The cost section of this tool asks for each quote and the number of years your dentist said to expect, then shows each as a cost per year. It never fills in a lifespan for you.

Use the result as one input, not the answer. Also ask whether the quote includes any temporary restoration, how many visits are needed and what your plan covers. A pre-treatment estimate from your insurer can show your share before you decide.

You do not need to know the answer before your appointment, only the right questions. The tool builds a list from what you tick, and these are good starting points for any crown or filling discussion. Writing the answers down makes it easier to compare a second opinion later.

• How much healthy tooth would be left if we used a filling?
• What could happen if we tried a filling first, or waited?
• Could you show me the problem on the X-ray or a photo?
• Which material do you suggest, and is it covered by my plan?