Teeth Fillings: A Simple Guide to Every Type

So your dentist found a cavity. And right after that news, they asked you to pick a filling type. If you just kind of stared at them, that’s completely fair. Nobody walks into a dental office having done teeth fillings research.

Silver, white, gold, porcelain — it’s a lot. And when you’re already sitting in the chair, it’s not the best time to figure it out.

That’s what this post is for. We’ll go through what teeth fillings actually do, why you might need one, and how the five main types stack up against each other. What they cost, how long they last, where they work best, and what the catch is with each one. After reading this, you’ll be able to have a real conversation with your dentist instead of just nodding along.

A few things to know going in:

• Tooth-colored teeth fillings are the most common choice today, but the other types still have their place.
• There’s no single “best” filling. It depends on the tooth, your wallet, and what matters to you.
• For most people, getting a filling isn’t a big deal pain-wise. Numbing medicine does most of the heavy lifting.

What Are Teeth Fillings?

A teeth filling is pretty much what it sounds like. Your dentist cleans out a damaged or decayed spot in your tooth, then fills that space with a material that hardens and holds.

The filling does a few things at once. It stops decay from spreading deeper into the tooth, restores the shape so you can chew normally, and seals everything off so bacteria can’t keep getting in.

A good comparison: think of a pothole in the road. Leave it alone and it grows. Cars keep hitting it, the edges crack further, and eventually it’s a serious problem. Fill it early and the road holds up fine.

Why Would You Need Teeth Fillings?

Cavities don’t get better on their own. Once decay breaks through the outer layer of your tooth, it just keeps going. A small cavity caught early is a quick fix. One that’s ignored for a year or two might need a root canal or a crown — or worse.

Common reasons people get teeth fillings:

• A cavity. This is by far the most common reason.
• A cracked or chipped tooth. Small chips can sometimes be repaired with filling material.
• Worn-down enamel. Grinding your teeth or brushing too aggressively can wear away tooth structure.
• An old filling giving out. Teeth fillings don’t last forever. Eventually they crack, loosen, or let decay sneak back in underneath.

Hypothetical example scenario: Picture a guy named Leo. He’s noticed a little zap of cold sensitivity when he drinks iced coffee, but he’s been blowing it off. At his checkup, his dentist spots a small cavity hiding between two back teeth. Because Leo came in when he did, it’s still small — just needs a filling. Another year of waiting and it might’ve been a much bigger conversation.

The 5 Main Types of Teeth Fillings

Here’s where it gets practical. Let’s go through each type — what it is, what’s good about it, and where it falls short.

1. Composite Teeth Fillings (Tooth-Colored)

Composite is made of a resin material mixed with fine glass particles. Your dentist layers it onto the tooth and hardens each layer with a blue curing light. The color gets matched to your tooth, so most people can’t even tell it’s there.

This is the most common type of teeth filling used today, especially for teeth that show when you talk or smile.

Pros:

• Blends in naturally
• Bonds directly to the tooth, so your dentist usually removes less of the healthy part
• Works on front and back teeth

Cons:

• Shorter lifespan than some options — typically 5 to 10 years
• Can pick up stains from coffee, tea, or wine over time
• Takes a little longer to place than amalgam

Cost: Mid-range. Insurance often covers it fully on front teeth but only partially on back teeth.

Best for: Smaller cavities, especially anywhere visible when you smile.

2. Amalgam Teeth Fillings (Silver)

Amalgam is the old-school silver filling. It’s been around for over 150 years and is made from a blend of metals — silver, tin, copper, and a small amount of mercury.

The mercury part makes some people nervous. The short answer is that major dental and health organizations consider amalgam teeth fillings safe for most adults. That said, the FDA does recommend that certain groups avoid them when other options are available: pregnant or nursing women, young children, and people with kidney problems or mercury allergies. Worth bringing up with your dentist if any of that applies to you.

Pros:

• Very durable — holds up well under heavy chewing
• Long lifespan, often 10 to 15 years or more
• Usually the cheapest option available
• Fast to place

Cons:

• Obvious to look at — it’s silver
• Can give nearby tooth tissue a grayish tint over time
• Requires a bit more tooth removal to place securely
• Contains mercury, which some people prefer to steer clear of

Cost: Low. Typically the most affordable teeth filling.

Best for: Back molars where strength matters more than appearance.

3. Gold Teeth Fillings

These are exactly what they sound like — real gold, mixed with other metals to add hardness. Gold teeth fillings are made as inlays or onlays (pieces that fit into or over the tooth) and are custom-made in a lab, so you’ll need at least two visits.

They’re not common anymore, but they have a loyal following for good reason.

Pros:

• Can last 15 to 30 years — some even longer
• Incredibly strong, won’t corrode
• Actually gentle on the opposing teeth they press against

Cons:

• The most expensive filling option
• Two visits minimum
• Hard to miss — it’s gold

Cost: High. Often the priciest choice.

Best for: Back teeth in people who want something that’s genuinely built to last.

Fictional anecdote: There’s a woman named Ruth, 70 years old. She has a gold filling she got back in her late twenties. It’s made it through decades of meals, a few too many hard candies, and one very regrettable bite on an olive pit. Still sitting there, solid as ever. Her dentist has half-jokingly said it’ll probably outlast both of them.

4. Ceramic Teeth Fillings (Porcelain)

Ceramic teeth fillings are made from dental porcelain — the same stuff used in many crowns. Like gold, they’re typically made as inlays or onlays. Some dental offices can mill them right there in a single visit using a special machine. Others send the impression to a lab, which means a second appointment.

Pros:

• Looks very natural — often even better than composite
• Resists staining better than composite does
• Durable, often lasting 10 to 15 years or more

Cons:

• On the pricier side, sometimes close to gold
• Porcelain can chip, especially if you grind your teeth
• May require two visits

Cost: High.

Best for: Larger cavities in visible areas, or for people who want something natural-looking that also holds up well over time.

5. Glass Ionomer Teeth Fillings

Glass ionomer is a tooth-colored filling material, but it works a bit differently from composite. It’s made from glass powder and an acid that react together to form a bond with your tooth. Its standout feature: it slowly releases fluoride, which can actually help protect the surrounding tooth from new decay.

The trade-off is that it’s not as tough as other teeth fillings.

Pros:

• Releases fluoride over time
• Bonds well to teeth
• Easier to place in spots that are hard to keep dry

Cons:

• Wears down faster than other types
• Color match isn’t as precise as composite
• Usually lasts 5 years or less
• Not suitable for high-pressure chewing areas

Cost: Low to mid-range.

Best for: Baby teeth, small cavities near the gumline, and sometimes as a base layer under another filling material.

Hypothetical example scenario: A 6-year-old named Mia has a small cavity in a baby tooth. It’s going to fall out on its own in a couple of years anyway. Her dentist goes with glass ionomer — it’s quick to place, it’ll protect the surrounding teeth with fluoride, and it only has to last long enough for the tooth to do its thing and come out naturally.

Quick Comparison of Teeth Fillings

Type	Appearance	Typical Lifespan	General Cost	Best Used On
Composite	Tooth-colored	5–10 years	$	Front or back teeth
Amalgam	Silver	10–15+ years	$	Back teeth
Gold	Gold	15–30 years	$$	Back teeth
Ceramic	Tooth-colored	10–15+ years	$$	Visible or larger areas
Glass ionomer	Tooth-colored	Up to 5 years	$–$	Baby teeth, gumline

These ranges are general. How long any teeth filling lasts depends on where it sits, how hard you bite, and how well you take care of your teeth day to day.

So How Do You Pick the Right Teeth Filling?

Honestly, your dentist will have a recommendation, and it’s worth asking for it. But here’s what usually shapes the decision:

1. Where’s the tooth? Visible teeth usually get tooth-colored fillings. Back teeth can handle stronger materials.
2. How big is the cavity? Small cavities are often a composite job. Bigger ones might call for an inlay, onlay, or crown.
3. What does your insurance cover? This matters more than people realize. Check before you commit.
4. How important is appearance to you? Some people genuinely don’t care about a silver molar. Others want everything to match.
5. Any health considerations? Pregnancy, allergies, or certain medical conditions can narrow the options.

Questions worth asking before you decide:

• “What type of teeth filling would you pick for this tooth, and why?”
• “How long should I expect this to last?”
• “What’s covered by my insurance?”
• “Is this a one-visit thing or two?”

Will Getting Teeth Fillings Hurt?

For most people, not really. The numbing shot is usually the worst part, and even that’s just a quick pinch. Once you’re numb, you’ll feel pressure and hear the drill, but actual pain is uncommon.

After the numbness wears off, some sensitivity to hot or cold is normal and usually settles down within a few days. If your bite feels off — like that tooth hits first when you close your mouth — call your dentist. That’s a very easy fix.

Making Your Teeth Fillings Last

Nothing complicated here:

• Brush twice a day with fluoride toothpaste.
• Floss daily.
• Lay off the ice chewing and hard candies.
• If you grind your teeth at night, talk to your dentist about a night guard.
• Don’t skip your checkups — small issues are a lot easier to deal with than big ones.

The Bottom Line

Different teeth fillings exist because different situations call for different solutions. Composite looks natural. Amalgam is tough and cheap. Gold goes the distance. Ceramic gives you the best of both worlds if budget isn’t a concern. Glass ionomer protects with fluoride where durability isn’t the priority.

None of them is perfect for every tooth. But now you know what each type of teeth filling brings to the table — and that’s enough to walk into your next appointment and actually participate in the conversation.

Ask your dentist what they’d recommend and why. You might be surprised how much easier the whole thing feels when you already know the basics.