If you grew up with a few silver fillings in your mouth, you might be surprised to learn just how different your options look today. Modern dentistry has largely shifted toward tooth-colored composite fillings, but amalgam (silver) fillings are still used in certain situations. If you’re facing a cavity and wondering which material is right for you, here’s an honest look at how the two compare.

What Are Amalgam Fillings?

Amalgam fillings have been used in dentistry for well over a century. They’re made from a combination of metals — primarily silver, tin, copper, and mercury bound together in a stable alloy. Once considered the standard for treating cavities, especially in back molars, amalgam is known for being extremely durable and relatively inexpensive to place.

What Are Composite Fillings?

Composite fillings are made from a mixture of plastic resin and fine glass or ceramic particles. Unlike amalgam, composite material is tooth-colored and can be shade-matched to blend in with your natural enamel. It’s applied in soft layers and hardened with a special curing light, bonding directly to the tooth structure rather than simply sitting within the cavity space.

Comparing the Two Materials

Appearance

This is where the difference is most obvious. Amalgam fillings are silver or gray and stand out clearly against natural tooth color, which is one of the main reasons many patients today prefer composite, particularly for fillings in visible areas like front teeth or upper molars that show when smiling or laughing.

Tooth Preparation

Amalgam fillings require removing a bit more healthy tooth structure to create a shape that mechanically holds the filling in place. Composite fillings bond directly to the tooth through a chemical bonding process, which generally allows dentists to preserve more of the natural, healthy tooth.

Strength and Durability

Amalgam has long been valued for its strength, particularly in molars that endure heavy chewing forces, and can last 10 to 15 years or more. Modern composite materials have improved dramatically and now offer strong durability as well, typically lasting 7 to 10 years, though they can be more prone to wear in very high-pressure biting areas compared to amalgam.

Placement Time

Composite fillings generally take a bit longer to place because of the layering and curing process, while amalgam can often be placed more quickly. For most patients, this difference amounts to just a few extra minutes in the chair.

Sensitivity

Some patients experience temporary temperature sensitivity after either type of filling, though composite fillings are less likely to cause the temperature-related expansion and contraction sensitivity that can sometimes occur with metal fillings.

Cost

Amalgam fillings are typically less expensive than composite, though many dental insurance plans cover a significant portion of either option. It’s worth discussing costs directly with your dental office, since coverage and out-of-pocket costs vary by plan.

Is There a Safety Concern With Amalgam?

Amalgam fillings do contain a small amount of mercury, bound in a stable compound with the other metals. Major health organizations, including the American Dental Association and the U.S. Food and Drug Administration, consider amalgam fillings safe for most patients based on decades of research. That said, some patients prefer to avoid mercury-containing materials altogether, and composite offers a well-established mercury-free alternative that performs well for the vast majority of cavity locations.

How the Filling Process Differs Between the Two Materials

Beyond the finished result, the actual placement process varies somewhat between the two materials. Amalgam is mixed and packed directly into the prepared cavity, where it hardens over several hours, meaning newly placed amalgam fillings need a little extra care with chewing for the first day. Composite, by contrast, is applied in thin layers and hardened almost instantly with a curing light, so it’s fully set by the time you leave the office. This also allows your dentist to build up the filling in a way that closely follows the natural contours of the tooth, layer by layer, which contributes to both the strength and the appearance of the final result.

Why Composite Has Become the Popular Choice

For most patients today, composite fillings offer the best overall balance of aesthetics, tooth preservation, and performance, which is why they’ve become the default choice at most modern dental practices — including for fillings in back teeth, where amalgam was once considered the only durable option. Advances in composite resin technology over the past two decades have closed much of the durability gap that once existed between the two materials.

When Might Amalgam Still Be Used?

Amalgam is occasionally still recommended in specific situations, such as very large cavities in back molars where maximum strength is a priority, or in cases where moisture control during placement is difficult, since composite requires a dry field to bond properly. Your dentist can advise whether these considerations apply to your particular situation.

Replacing Old Amalgam Fillings

If you have older amalgam fillings that are cracked, leaking, or simply reaching the end of their lifespan, your dentist may recommend replacing them with composite. This isn’t typically an urgent cosmetic decision — it’s usually driven by the condition of the existing filling. A failing filling can allow bacteria to seep in around the edges, potentially leading to new decay beneath the surface. Regular checkups and X-rays help catch this before it becomes a bigger problem.

Frequently Asked Questions

Can I replace my old amalgam fillings with composite for cosmetic reasons alone? Yes, many patients choose to replace amalgam fillings with composite for appearance reasons, particularly in visible areas. That said, removing a filling that’s otherwise intact and functioning well does involve some removal of healthy tooth structure, so it’s worth discussing the trade-offs with your dentist rather than assuming replacement is automatically the better choice.

Do composite fillings stain over time? Composite material can pick up minor staining from foods and beverages like coffee, tea, or red wine over many years, similar to natural enamel, though it generally holds its color well with good oral hygiene.

Are composite fillings strong enough for molars? Yes, modern composite materials have improved significantly and are routinely used in molars today. For very large cavities in high-pressure chewing areas, your dentist may discuss whether an inlay, onlay, or crown would provide better long-term durability than a large filling of either material.

How do I know which filling material my insurance covers? Coverage varies by plan. Many insurance plans cover composite fillings at the same rate as amalgam, though some plans base reimbursement on the cost of amalgam even if you choose composite, with the difference paid out of pocket. Your dental office’s billing team can typically clarify your specific benefits.

Choosing the Right Filling Material in Bellingham

Every mouth and every cavity is a little different, and the “best” filling material depends on the location of the tooth, the size of the cavity, your bite, and your personal preferences around appearance and materials. A good dentist will walk you through these factors rather than defaulting to a one-size-fits-all answer.

At Love Dentistry in Bellingham, Dr. William Fong and Dr. Manpreet Kaur primarily use modern composite materials to provide natural-looking, durable restorations, while taking the time to discuss your specific case and any material preferences you may have.

If you have a cavity that needs attention, or you’re curious about replacing an older filling, Love Dentistry is ready to help. Call (360) 623-7318 or request an appointment online to schedule a visit at the Bellingham office, located at 4101 Eliza Ave.