Picture this: you’re sitting in the dentist’s chair, mouth wide open, and the dentist drills into your tooth. Back in the ’70s or ’80s, chances were good you’d get a shiny, silver-gray filling – an amalgam filling. I still remember how my grandmother used to complain about those ‘heavy’ fillings in her mouth, which sometimes gave her a metallic taste.
But what many people don’t know is that these fillings are half mercury. Mercury! That stuff we associate with toxic fumes and environmental disasters. The question that’s been floating around for decades: do these fillings release toxic substances over the long term, like mercury leakage in your mouth? Let’s dig into this, taking a look at the facts, the myths, and the science behind them.
Read also: [GROOT DOSSIER] Amalgam Fillings and the Possible Release of Toxic Substances Over the Long Term
What are amalgam fillings?
Amalgam fillings, also called ‘silver fillings,’ have been in use since the 19th century. They became popular because they were cheap, durable, and easy to place. In the United States and Europe, dentists filled millions of teeth with this mixture of metals: silver, tin, copper, and – yes – liquid mercury. The mercury binds the other metals into a hard paste that fits perfectly into a cavity.
Especially in the post-war years, it was the standard for treating cavities. But times change. Nowadays, they’re being phased out in many countries, partly for environmental reasons (mercury pollutes water), but also due to health concerns. In the EU, their use in children under 15 and pregnant women has been banned since 2018.
Does mercury leak out?
Now the key question: does mercury leak from these fillings? Yes, in small amounts. When you chew, eat, or brush your teeth, the surface of the filling wears down slightly, and mercury vapor is released. Studies show that this mercury ends up in your saliva, blood, and urine.
It’s not a sudden ‘leak’ like a broken thermometer, but a gradual process over years. Researchers have measured that an average person with multiple amalgam fillings inhales or ingests about 1 to 5 micrograms of mercury daily. That sounds like little, but mercury accumulates in the body, especially in the kidneys, brain, and liver.
Is that toxic over the long term?
Is that toxic over the long term? Opinions differ. Official agencies like the FDA and the American Dental Association (ADA) say no – for most people, anyway. They base this on numerous studies that find no direct link between amalgam fillings and health problems in adults.
There’s no evidence of chronic poisoning in the general population, and exposure remains below safe limits. Even in children under six, who are more vulnerable, the FDA found no clinical damage. But they do warn about at-risk groups: pregnant women, people with kidney problems, or multiple sclerosis. In them, mercury can cross the placenta or worsen neurological symptoms.
The counter-movement
Take, for example, stories of people who suffered for years from a metallic taste or tingling, and felt better after ‘safe’ removal (using special equipment to minimize vapor).
Critics argue that mercury is neurotoxic – we know that from industrial accidents – and that even low doses can cause damage over time, such as to the hypothalamus, which affects mood. A 2019 study showed that drilling into amalgam releases mercury vapor for hours, which is especially risky during removal.
What to do if you have amalgam?
What to do if you still have amalgam? The FDA recommends not removing intact fillings just like that, because that temporarily releases more mercury and destroys healthy tooth structure. Alternatives like white composite or ceramic fillings are more aesthetic and mercury-free, but sometimes less durable. In the Netherlands and Belgium, dentists have been using them less for years, and many practices offer ‘mercury-safe’ removal.
Read also: [GROOT DOSSIER] Amalgam Fillings and the Possible Release of Toxic Substances Over the Long Term
Conclusion
Ultimately, it depends on your personal situation. Are you healthy and have no complaints? Probably no worries. But if you have unexplained symptoms, or if you’re pregnant, talk to your dentist about it. The controversy continues, with science on both sides. Maybe it’s like many old habits: better to prevent than cure. Or, in this case, better a white filling than a gray one with a mercury tail.
Verified Sources
- Information for Patients About Dental Amalgam Fillings – FDA
- The Dental Amalgam Toxicity Fear: A Myth or Actuality – PMC
- How Do Different Physical Stressors’ Affect the Mercury Release … – PMC
- Mercury Poisoning Symptoms and Dental Amalgam Fillings – IAOMT
- Dental Amalgam Fillings – FDA
- Dental amalgam controversy – Wikipedia
- Safety of Dental Amalgam – IADR
- Dental Amalgam Danger: Mercury Fillings and Human Health – IAOMT
- Dental fillings raise levels of mercury in the body, UGA study says
- Mercury in Dental Amalgam | US EPA
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Frequently Asked Questions
What are amalgam fillings?
How bad are amalgam fillings?
Amalgam fillings release small amounts of mercury, but according to scientific committees like the EU’s SCENIHR, there is no proven risk of systemic health effects for the general population. Vulnerable groups such as pregnant women or children may want to consider alternatives, and there is debate about possible links to neurological complaints, although this is not convincingly proven.
Are amalgam dental fillings harmful?
For most people, they are safe and do not cause systematic health problems, as confirmed by health organizations. Yet there is controversy due to the mercury content, with some studies pointing to possible risks for sensitive individuals, such as allergies or long-term exposure. The environmental aspect plays a larger role in current discussions.
Why don’t dentists use amalgam fillings anymore?
Dentists are switching to alternatives like composite or ceramic due to better aesthetics, less invasive techniques, and growing regulations. In Europe, the Minamata Convention on mercury is driving the phase-out, with a focus on environmental protection and safer materials.
Why are amalgam fillings banned?
In the EU, amalgam fillings are banned from use and production as of January 1, 2025, primarily for environmental reasons and to reduce mercury pollution, in line with the Minamata Convention. It’s not a direct ban due to health risks, but a preventive measure; existing fillings in good condition do not need to be removed.
Is it wise to replace amalgam fillings?
If the fillings are in good condition, replacement is not necessary for health, but may be desirable for aesthetics or if worn. Always consult with a dentist, as unnecessary removal can release more mercury and damage tooth structure.
