Mercury Dental Fillings: Risks, Who’s Vulnerable, and Removal Checklist

Mercury fillings, commonly known as dental amalgam, are used to restore cavities. These restorations are made from a blend of metals and typically contain about 50% elemental mercury by weight.

Amalgam fillings release small amounts of mercury vapor over time. This mercury can be absorbed by the body and distribute to organs such as the brain, kidneys, liver, lungs, and gastrointestinal tract.

Because the word “mercury” often evokes concern, the dental industry uses several alternative names for these restorations. You may hear them called:

• Amalgam fillings
• Mercury amalgam fillings
• Dental amalgam fillings
• Silver fillings
• Silver amalgam fillings

Are mercury fillings still used?

Yes. Mercury amalgam remains a commonly used material for filling cavities, particularly because it is inexpensive and durable. Amalgam has been used in the United States for more than 150 years and has been a subject of debate since its introduction.

Early critics considered the use of mercury in dentistry risky, and concerns about methylmercury poisoning emerged in the mid-1800s. Over time, major dental organizations formed and defended the continued use of amalgam, while ongoing research has continued to evaluate potential health implications for certain individuals.

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If you prefer to avoid mercury in dental restorations, seek a “mercury-free” dentist who offers alternatives such as porcelain or composite resin fillings. These options eliminate exposure to mercury vapor from amalgam.

Below is an overview of mercury content in amalgam, potential health concerns associated with exposure, which groups are most at risk, and considerations for removal of existing amalgam fillings.

How much mercury is in amalgam/silver fillings?

Dental amalgam contains roughly 50% elemental mercury by weight. The remainder is a mixture of metals such as silver, tin, copper, zinc, and trace elements.

Have dentists stopped using mercury? Many dentists have not stopped using amalgam. In the United States, a significant percentage of dental practices still offer amalgam as a lower-cost filling option.

A typical low-copper amalgam composition is approximately:

• 50% mercury
• 22–32% silver
• 14% tin
• 8% zinc
• Other trace metals

Evidence and reported health concerns linked to amalgam fillings

Research has shown that dental amalgam can be a major source of mercury exposure in humans. Autopsy and biomonitoring studies indicate higher mercury levels in people with amalgam restorations compared with those without.

Scientific literature has explored associations between mercury exposure from amalgam and a range of health conditions. While causation is complex and varies by individual, reported associations include:

1. Allergies
2. Alzheimer’s disease
3. Amyotrophic lateral sclerosis (ALS)
4. Anxiety
5. Appetite loss
6. Autism spectrum disorders
7. Autoimmune disorders
8. Cardiovascular issues
9. Chronic fatigue syndrome
10. Depression
11. Endocrine disruption
12. Gingivitis
13. Hallucinations
14. Headaches
15. Hearing loss
16. Insomnia
17. Kidney issues
18. Liver issues
19. Memory loss
20. Mood changes
21. Multiple sclerosis
22. Nervous system issues
23. Oral cancer
24. Oral lichen planus
25. Parkinson’s disease
26. Miscarriage or newborn death
27. Periodontal disease
28. Reproductive dysfunction/infertility
29. Respiratory issues
30. Restless leg syndrome
31. Suicidal ideation
32. Thyroid disorders
33. Tremors
34. Weight loss

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Why are amalgam fillings still used?

There are several reasons amalgam remains popular in clinical practice:

1. Cost effectiveness — amalgam is typically less expensive than many other restorative materials.
2. Durability — amalgam has a long clinical track record and performs well under chewing forces.
3. Ease of placement — the material adapts readily to the shape of the prepared tooth.
4. Antibacterial properties — amalgam can inhibit bacterial activity at the margins of a restoration.

Because many patients never experience noticeable adverse effects from amalgam, several government and health agencies continue to consider it acceptable for general use, while recommending caution for specific groups.

What do government and health agencies say about mercury fillings?

• The American Dental Association (ADA) maintains that amalgam is a valuable, viable, and safe restorative option.
• The U.S. Food and Drug Administration (FDA) has stated that dental amalgam is safe for most people older than 6, while acknowledging concerns for certain populations.
• The Centers for Disease Control and Prevention (CDC) recognizes that amalgam restorations contribute to low-level mercury exposure.
• The Environmental Protection Agency (EPA) identifies dental office wastewater containing amalgam waste as a notable source of mercury in sewage systems.
• The World Health Organization (WHO) has noted that exposure to mercury, even in small amounts, can carry health risks, and takes a cautious stance in some communications.
• Regulatory approaches vary globally. For example, the European Union has restricted amalgam use in children under 15 and in pregnant or breastfeeding women, and several countries plan further limits or bans.

Who is at the most risk with mercury fillings?

• Children under age 15
• Pregnant and breastfeeding women
• People who grind their teeth (bruxism)
• Individuals with certain genetic variations affecting detoxification (e.g., MTHFR mutations)
• Older adults with long-standing amalgam restorations
• Workers with occupational mercury exposure
• People with high exposure to electromagnetic fields (EMFs) may have heightened sensitivity, according to some hypotheses

Everyday activities such as chewing, consuming hot beverages, and brushing can slightly increase mercury vapor release from amalgam restorations. Dental professionals and staff who handle amalgam are also at higher occupational risk without proper safeguards.

Should you have amalgam fillings removed?

The decision to remove amalgam fillings should be individualized and made in consultation with a qualified dentist. Removal can be appropriate in many cases, but the process itself can temporarily increase mercury exposure if not performed with proper precautions.

Consider discussing removal with your dentist if any of the following apply:

• You have elevated mercury levels in blood, urine, or other validated tests.
• You show symptoms consistent with mercury exposure (insomnia, muscle weakness, dizziness, mood changes, headaches, tremors, etc.).
• Your amalgam restorations are old, deteriorating, or have been in place for many decades.

If testing shows low mercury levels and you have no related symptoms, removal may not provide benefit and could temporarily increase exposure. Pregnant or nursing women should exercise particular caution and consult their healthcare providers.

When removal is recommended, seek a dentist experienced in “mercury-safe” or “mercury-aware” protocols. These clinicians use specific techniques—such as high-volume suction, rubber dams, and isolation methods—to reduce vapor and particulate exposure during removal. Compare post-removal mercury measurements with pre-removal levels, limit high-mercury foods like certain fish for a period, and consider appropriate detox strategies under professional guidance.