Before You Agree to a Dental Filling: Questions About Risks, Benefits and Alternatives

A dental filling can help restore a tooth with significant damage, but the material and timing matter. Before treatment begins, ask whether the decay is active and deep enough to require a restoration, how much healthy tooth structure will be removed, and what other options may be reasonable.

This discussion may be especially important if you are pregnant, planning a pregnancy, nursing, have a young child who needs treatment, or have kidney disease, a neurological condition, or a known sensitivity to metals. The U.S. Food and Drug Administration (FDA) identifies these groups as potentially more vulnerable to effects associated with mercury-containing amalgam fillings and encourages non-amalgam materials when they are clinically appropriate.

First ask: Does this tooth definitely need a filling?

Not every early area of tooth decay requires drilling and filling immediately. Depending on the location, depth, activity, and risk of progression, a dentist may discuss monitoring or nonrestorative care for some lesions. The American Dental Association has separate guidance for restorative and nonrestorative caries management.

Ask:

Is the decay active, or is it stable?
Has the tooth formed a cavity, or is the change limited to the surface?
What could happen if we monitor it for now?
How will we check whether it is getting worse?
Would fluoride, improved home care, a sealant, or another nonrestorative approach be appropriate in this situation?

If the tooth has lost enough structure, is painful, or is at risk of breaking, a restoration may be the safer option. The decision depends on the tooth and the individual clinical findings, not just on the word “cavity.”

Why are you recommending this filling material?

Dental amalgam, often called a silver filling, is made from elemental mercury combined with metals such as silver, tin, and copper. It has been used for more than 150 years and is strong, durable, relatively inexpensive, and useful when moisture makes it difficult for another material to bond to the tooth.

Composite resin is a common tooth-colored alternative. It can match the surrounding tooth and may require less removal of healthy tooth structure. However, it can be more difficult to place when the area cannot be kept dry, may cost more, and may be less durable in some situations.

Glass ionomer materials are also tooth-colored and can release fluoride over time. They may conserve tooth structure, but they are generally better suited to smaller restorations and are not as durable as amalgam for large, high-stress fillings.

For a tooth with substantial loss of structure, an indirect restoration such as a crown or other laboratory-made restoration may be discussed. These options can be more durable but are usually more expensive and involve a different treatment process. The FDA’s comparison of dental-caries treatment options describes these tradeoffs, including moisture control, tooth conservation, durability, and cost.

Ask your dentist:

What makes this material suitable for this tooth?
How much healthy tooth structure must be removed?
How long is this option expected to last in this location?
What would make the filling more likely to crack, leak, or need replacement?
Would a tooth-colored filling, glass ionomer, repair, or indirect restoration be reasonable?

What are the concerns about amalgam fillings?

The FDA says dental amalgam releases low levels of mercury vapor. For the general population, the agency says available evidence does not show that exposure from dental amalgam causes adverse health effects. At the same time, the FDA notes uncertainty about long-term effects in some higher-risk groups and encourages non-amalgam materials when they are clinically appropriate.

Those groups include pregnant people and developing fetuses, people planning a pregnancy, nursing people and their infants, children—especially those younger than 6 years—people with pre-existing neurological disease, people with impaired kidney function, and people with a known allergy or sensitivity to mercury or other amalgam metals.

If any of these circumstances apply, tell the dentist before treatment. Ask whether composite resin or glass ionomer would work for the tooth and whether the benefits and limitations of those materials have been explained clearly. The National Institute of Dental and Craniofacial Research also provides a plain-language explanation of amalgam and its alternatives.

Should an old silver filling be removed?

Usually not just because it contains mercury. The FDA does not recommend removing an intact amalgam filling that is functioning well and has no decay underneath it. Removal can sacrifice healthy tooth structure and temporarily increase mercury vapor exposure.

Replacement may be considered when a filling is failing, there is decay beneath it, the tooth is cracked, or a clinician determines that removal is clinically necessary. If you have a documented metal sensitivity or a neurological or kidney condition, discuss the decision with your dentist and, when appropriate, your physician.

What about cost and insurance coverage?

Material choice can affect the price of treatment. The FDA lists amalgam as generally less expensive than composite resin, while indirect restorations such as crowns may cost more. Your actual bill depends on the tooth, the procedure, the dentist, your plan, and whether the service is considered covered.

Medicaid rules are particularly variable. Medicaid.gov explains that Medicaid and CHIP must provide dental benefits for children, including relief of pain and infections, restoration of teeth, and maintenance of dental health. States decide whether and how to provide dental benefits for adults.

On July 22, 2026, the Department of Health and Human Services announced that CMS had encouraged state Medicaid directors to restrict or end coverage for dental amalgam procedure codes or encourage resin-based composite codes. The announcement was an encouragement to states, not a nationwide requirement. Coverage and billing details may therefore differ by state and plan.

Before treatment, ask for:

The procedure code and estimated total cost
Your expected out-of-pocket amount
Whether your insurance covers the proposed material
Whether an alternative material would change your cost
Whether prior authorization or a second appointment is required

A short checklist for the dental chair

You can use these questions to make the discussion more concrete:

What did the examination or X-ray show?
Is the decay cavitated and active, or could it be monitored?
What happens if treatment is delayed?
Why do you recommend this material for this tooth?
What are the main benefits, risks, and expected lifespan?
What alternatives are reasonable, including a less invasive option?
How much healthy tooth structure will be removed?
What will the treatment cost, and what does my plan cover?
Do pregnancy, nursing, age, kidney disease, neurological disease, or metal sensitivity change the recommendation?
Should an existing filling be repaired, monitored, or replaced?

When to seek prompt dental care

Do not ignore worsening tooth pain, facial or gum swelling, fever, a broken tooth, or drainage. Seek prompt dental evaluation for these symptoms. Trouble breathing or swallowing, rapidly increasing facial swelling, or swelling around the eye can be an emergency requiring immediate medical care.

The practical takeaway

A well-planned filling decision weighs the condition of the tooth, the amount of healthy structure that can be preserved, the strengths and limitations of each material, personal health factors, and cost. A reasonable next step is to ask the dentist to explain why the filling is needed now, what alternatives exist, and how the recommendation changes—if at all—because of your health history or insurance coverage.

Key sources

Editorial note: Weence articles are researched from cited public-health, medical, regulatory, journal, and reputable news sources and may be drafted with AI assistance. They are checked for source support, clarity, and safety guardrails before publication.

This article is for general informational purposes only and is not medical advice. Research findings can be early or incomplete, and health guidance can change. Always talk with a qualified healthcare professional about personal symptoms, diagnosis, medications, vaccines, screenings, or treatment decisions. If you think you may have a medical emergency, call emergency services right away.