Amalgam vs Composite Fillings: Which Is Better for Your Teeth?

When decay breaks down and weakens the tooth and leaves it vulnerable to further decay. A dental filling helps repair that damage by sealing the affected area, restoring the tooth’s strength and function. The dentist first removes any decayed tissue, cleans the cavity, and then fills the space with a durable material to prevent bacteria from re‑entering.

Today, the most common materials used are amalgam fillings, which is a blend of metals such as mercury, silver, tin, and copper, and composite resin fillings, made from a tooth‑coloured mix of resin and glass particles. Both work effectively, yet many patients wonder which is safer, lasts longer, or simply looks better.

What Are Amalgam Fillings?

Amalgam fillings are often called silver fillings, and are made from a blend of metals. The mercury binds the other metals together to form a strong, stable material that hardens quickly once placed in the tooth. This combination has been used in dentistry for years due to its strength and reliability, particularly for repairing molars that endure heavy chewing pressure.

One of the main advantages of amalgam is its durability. It can withstand years of wear and is less likely to crack under force compared to some other materials. This makes it a practical choice for patients with larger cavities or teeth exposed to constant stress. 

That said, amalgam does come with a few trade-offs. For one, its metallic colour makes it stand out, especially when used on front teeth. And because the material doesn’t bond directly to the tooth, the dentist often needs to remove slightly more enamel to create a secure hold. In addition, while the small amount of mercury in amalgam is considered safe by dental authorities, some people may have sensitivities or prefer to avoid it. It’s also generally avoided for patients who are pregnant, very young, or have known metal allergies.

What Are Composite Resin Fillings?

Composite resin fillings are tooth-coloured restorations made from a mix of plastic and ceramic particles. They’re a popular choice for patients who want something that blends in well with their natural teeth, especially when the cavity or repair is visible while smiling or talking.

Beyond treating tooth decay, composite resin is also used to fix chipped, cracked, or worn teeth. Dentists can layer and shape the material directly onto the tooth, which means they often remove less of the healthy structure during the procedure. This is a key difference from materials like amalgam, where more drilling is usually needed.

Another benefit is that composite fillings don’t typically conduct heat and cold when eating hot or cold foods, which can mean less post-procedure sensitivity for some patients. However, placement requires a dry environment for the bonding process to work properly, which can make it more technique-sensitive. Over time, composite may wear down faster than metal in high-stress areas like molars, especially if you clench your jaw or chew with force.

That said, when placed well and cared for, composite resin fillings can last for years, offering both function and a natural look without compromising too much of your original tooth.

Differences Between Composite Filling and Amalgam

When deciding between composite resin and amalgam fillings, factors like cost, aesthetics, placement area, and longevity matter. Each option has its trade-offs, and the better choice often depends on your budget, how visible the tooth is, and how much chewing force it needs to withstand.

Feature	Composite Resin Fillings	Amalgam Fillings
Appearance	Tooth-coloured, blends well	Silver, noticeable
Tooth Preservation	Minimal removal required	Requires more enamel removal
Durability (Back Teeth)	Moderate, may wear with pressure	High, withstands heavy chewing
Longevity	~5–10 years	~10–15 years
Cost	Typically higher	Generally more affordable
Temperature Sensitivity	Less reactive	May expand/contract
Placement Consideration	Moisture-sensitive during filling	Easier to place in most conditions

Which Filling Should You Choose?

So, based on the differences outlined above, choosing between composite and amalgam fillings comes down to your individual needs. Both have pros and cons, and while your preferences matter, your dentist’s recommendation will take into account what works best for your situation, especially for long-term function and comfort.

Here are some key factors to consider:

• Tooth Location and Size: Composite fillings work well for small to medium-sized cavities, especially in front or visible teeth. Amalgam may be a better fit for larger cavities or molars due to its strength.
• Aesthetic Concerns: If you’re concerned about how the filling looks when you smile, composite is the preferred option as it can be matched to your natural tooth colour.
• Durability and Lifespan: Amalgam tends to last longer in high-wear areas like the back teeth. Composite materials are also strong but may wear out sooner if exposed to heavy biting pressure.
• Budget: Composite fillings usually cost more than amalgam. If you’re looking for a more budget-conscious option, amalgam may be worth considering for teeth that aren’t visible.
• Allergies or Sensitivities: If you have a known sensitivity to metals or mercury, let your dentist know. Composite fillings are metal-free and may be safer in those cases.

Either way, always speak with your dentist before deciding. They’ll guide you based on your oral health, medical background, and what suits your daily needs best.

Choosing the Right Filling for Long-Term Dental Health

For both amalgam and composite fillings, each comes with its own pros and limitations, so there’s no universal answer to the question: which is better, amalgam or composite filling? What matters most is how well the choice suits your specific condition, bite pattern, and daily habits.

Your dentist will assess the size and location of the cavity, any underlying health concerns, and your aesthetic goals before recommending a suitable material. If you’re still unsure, the best next step is to have a proper discussion with your dentist, especially if you’re thinking long term.

Don’t feel pressured to make the decision on your own. A professional assessment can help you weigh all relevant factors, including the tooth filling cost in Singapore, potential wear, and how the material will behave in your mouth over time.