Are Fillings Metal? Your Guide to Dental Restoration Materials

If you have been diagnosed with a cavity, you may be wondering about the materials used to restore your tooth. To answer the question, “Are fillings metal?”—some traditional dental fillings are made of metal alloys, while modern dentistry offers various metal-free, tooth-colored alternatives that prioritize both aesthetics and durability. According to the National Institute of Dental and Craniofacial Research, 92% of adults aged 20 to 64 have experienced cavities, making this a very common dental procedure. As the American Dental Association (ADA) and other professional bodies suggest, patients should find resources, products, and information to give their patients a healthier future.

Types of Dental Fillings

There are many types of dental fillings, and both metal and metal-free fillings are available. The best type of filling for a cavity depends on factors like size and location, and your dentist can recommend the best material for your specific situation.

Metal-Based Fillings

• Dental Amalgam: Often called “silver-colored fillings,” these have been used for over 100 years. As the Food and Drug Administration (FDA) explains, they consist of liquid mercury mixed with powdered silver, tin, and copper. The mercury binds these components into a durable material, which the American Dental Association (ADA) notes is an excellent option for large cavities in back teeth. Clinical note: Amalgam is often chosen for areas where moisture control is difficult during placement, as it is less sensitive to saliva than resin-based materials.
• Gold: These restorations, also known as inlays or onlays, are composed of a mixture of metals including gold and copper. As the ADA notes, they are the most durable option and can last for more than 20 years.

Metal-Free Fillings

• Composite: These tooth-colored fillings are made of a mixture of resin and glass, according to the NHS. While they offer a more natural look than metal, the ADA notes they may require replacement more frequently.
• Glass Ionomer: Made of powdered glass, these tooth-colored fillings form a chemical bond with the tooth. The NHS notes that these fillings have the added benefit of releasing fluoride to help strengthen enamel and prevent future decay. Clinical note: Because they are less wear-resistant than composite or metal, glass ionomers are typically reserved for non-biting surfaces or pediatric applications.

Safety and Considerations

The FDA and ADA consider amalgam filling safety for adults and children over the age of 6, noting that the mercury in fillings is not the same type that accumulates in fish. However, the FDA reports that some individuals may have allergies or sensitivities to metals like copper or tin, which can cause contact reactions. Red flag: If you experience persistent gum irritation, metallic taste, or localized swelling near a restoration, consult your dentist to rule out a contact allergy. If you have such sensitivities or prefer a more natural appearance, discuss these concerns with your dentist.

Frequently Asked Questions

Are metal-free fillings as strong as metal ones?

While metal fillings are historically known for high durability, modern composite resins are advanced and strong enough to withstand daily chewing for most patients.

Why might I choose a metal-free filling?

Metal-free fillings are often preferred for their aesthetic appeal, as they blend in with your natural tooth color. Additionally, glass ionomer fillings provide the unique benefit of fluoride release.

What should I do if I have a cavity?

Do not delay treatment. If left untreated, cavities will worsen, potentially leading to more complex procedures. Consult your dentist to determine the best filling material for your specific needs, and ask about what to expect during the procedure.

Are there risks to amalgam fillings?

While the FDA and ADA deem them safe for the general population, individuals with known allergies to metals should inform their dentist to avoid potential contact reactions, which may sometimes manifest as a metallic taste.