Tooth-Colored vs. Silver Fillings: Which Should You Get?

If you've got a cavity that needs fixing, you'll likely get to choose between a tooth-colored filling and a silver (amalgam) one. Most people don't know enough about either option to feel confident choosing. Here's a plain breakdown of both so you can walk into your appointment knowing what you want.

What Each Filling Is Made Of

Tooth-colored fillings are made from composite resin, a mixture of plastic and fine glass particles. Your dentist bonds the material directly to your tooth, and it hardens under a curing light.

Silver fillings are made from dental amalgam, which is a mix of metals including silver, tin, copper, and mercury. The mercury binds the other metals together and makes the material moldable before it sets. Amalgam has been used in dentistry for over 150 years.

Both materials fill the cavity and restore the tooth's function. The differences show up in how they look, how long they last, and what they cost.

How They Look

Composite resin matches your tooth color. Your dentist picks a shade that blends with the surrounding enamel, so most people can't tell a filling is there at all. This matters most for visible teeth like your front teeth or premolars.

Amalgam is silver-gray and doesn't blend in. On back molars, it's usually not visible when you talk or smile. But it does darken over time, and teeth around an old amalgam filling can take on a grayish tint.

If appearance is your top priority, composite wins without much debate.

Durability and Wear

Amalgam is tough. It handles the grinding pressure of back molars well, and a well-placed amalgam filling can last 15 years or longer. That track record is part of why dentists have used it for so long.

Composite has improved a lot over the past two decades. Modern composite fillings hold up well under normal chewing pressure. Most last 7 to 10 years on back teeth, and longer on teeth that don't take as much force.

If you grind your teeth at night, your dentist might factor that in. Heavy grinding wears composite down faster than amalgam. A night guard can help protect either type of filling if grinding is an issue.

Placement and Tooth Preparation

Getting a composite filling placed takes a bit more time. The dentist needs to keep the area dry during bonding, and they apply the material in layers, curing each one before adding the next. The process is more technique-sensitive than placing amalgam.

Amalgam is more forgiving to place. It doesn't require the same dry-field conditions, which is one reason some dentists still prefer it for large cavities deep in the mouth where moisture control is harder.

With composite, your dentist removes only the decayed tooth structure. Amalgam sometimes requires removing a small amount of healthy tooth to create a shape that holds the filling mechanically. Over many years, that adds up if you're replacing fillings.

Cost and Insurance Coverage

Amalgam fillings generally cost less, and most dental insurance plans cover them at a higher percentage than composite. Some plans cover composite at the amalgam rate for back teeth, which means you pay the difference out of pocket.

Composite fillings cost more upfront. The exact difference depends on your insurance plan and the size of the cavity. For a small front-tooth filling, the gap is usually minor. For a large molar filling, it can be more noticeable.

Ask your dental office to run a benefits check before your appointment so you know what your plan covers. No one likes a surprise bill.

What About Safety Concerns?

Some patients ask about the mercury in amalgam. The mercury in amalgam fillings is bound to other metals, which makes it behave differently than pure mercury. Major health organizations, including the FDA and the American Dental Association, consider amalgam safe for most adults.

That said, some people prefer to avoid it. Patients who are pregnant, children under six, or people with certain kidney conditions are generally advised to choose composite instead. If you have concerns, bring them up with your dentist. It's a reasonable conversation to have.

Composite contains no mercury. For patients who want to avoid amalgam entirely, composite or other tooth-colored materials are a reliable alternative.

Both filling types do the job. The right choice depends on where the cavity is, your budget, how you feel about appearance, and your dentist's recommendation for your specific tooth. If you're due for a dental exam or think you might have a cavity, schedule an appointment at Hastings Family Dental Care and we'll walk through your options together.