10 Essential Fluoride Facts Everyone Should Be Aware Of

"Have you ever encountered a communist drinking a glass of water?"

In Stanley Kubrick's 1964 film "Dr. Strangelove or: How I Learned to Stop Worrying and Love the Bomb," this question sparks a paranoid tirade about the risks of fluoridating water.

Even after nearly five decades, water fluoridation remains a contentious issue. But how much do you — and the experts studying it — truly understand about the risks and advantages of fluoride? The medical and dental communities largely advocate for public education on fluoride's benefits. However, vocal critics argue that the potential dangers of fluoridation (or excessive fluoride) far outweigh the cosmetic benefits of a brighter smile.

In the upcoming sections, we'll clarify widespread misconceptions about fluoride — or its absence — and examine the ongoing debate over community water fluoridation. This will help you form your own opinion on how fluoride impacts your health and local environment. But first, let's explore what fluoride is not.

10: Fluoride is not fluorine.

If you're searching for fluoride on your periodic table, you won't find it. Fluorides are compounds formed when fluorine — represented by F on the periodic table — bonds with a metal. In this article, when we mention fluoride in drinking water, toothpaste, or food additives, we're primarily referring to sodium fluoride. However, other fluoride compounds are sometimes used for large-scale water treatment.

Fluorine, a naturally occurring gas, can irritate the eyes, skin, and respiratory system. However, when combined with sodium, it becomes water-soluble, making it an effective ingredient for adding fluoride to drinking water, toothpaste, mouthwashes, and various dental products.

Fluoride does build up in plants and animals. In animals, including humans, fluoride accumulates in bones or soft tissues. High levels of fluoride accumulation can lead to brittle bones and increase the risk of skeletal damage. In extreme cases, excessive fluoride can even affect reproductive organs and fertility [source: ATSDR].

Later, we'll delve into the risks of excessive fluoride exposure, but first, let's examine how toxic fluoride actually is.

9: Fluoride is a poison ... and so is your Pabst.

While fluoride isn't listed on the periodic table, it is a naturally occurring mineral. It exists in the air, food, and naturally in water. However, the levels of fluoride in these sources can vary significantly, sparking debates about whether to adjust fluoride levels in water supplies.

As with any chemical or mineral, toxicity depends on the dose. Excessive ingestion or accumulation can lead to over-toxicity. However, don't be alarmed—by this logic, almost anything could be deemed poisonous. For example, consuming large quantities of water can be fatal. In controlled amounts, fluoride has been shown to reduce cavities and tooth decay in humans [source: ATSDR].

If you're puzzled about how something toxic can also be beneficial, consider the body's interaction with alcohol. In moderation, it offers health (and psychological) advantages, but consuming nine shots of "Tequila Sunrises" in nineteen minutes will quickly reveal its toxic nature.

While fluoride does carry some risks, such as fluorosis, which we'll discuss later, it's important to understand why it was considered beneficial in small doses. The introduction of community water fluoridation intensified the debate around fluoride, fueling the skepticism of characters like Colonel Jack D. Ripper in "Dr. Strangelove."

8: Some Communities Add Fluoride to Water

One might assume that fluoride's benefits would be observed in individuals with either high fluoride exposure and flawless teeth or low exposure and dental issues. Interestingly, in 1901, a Colorado dentist noticed his patients had brown-stained teeth but remarkably few cavities [source: CDC].

Further research into water sources revealed that high fluoride levels could cause fluorosis (tooth discoloration or damage), while lower concentrations effectively prevented cavities (also known as "caries"). In 1945, a comprehensive, long-term study was conducted in three U.S. cities and one Canadian city, where fluoride was added to water at 1.0-1.2 parts per million (ppm). Over 13-15 years, cavities in children decreased by 50%-70%, and fluorosis rates matched those in areas with natural fluoride levels of 1.0 ppm [source: CDC].

The practice of community water fluoridation expanded rapidly, yielding impressive results: from 1966 to 1994, the rate of decayed, missing, or filled teeth in 12-year-olds in the U.S. dropped by 68% [source: CDC].

Cavities have decreased in both fluoridated and non-fluoridated communities, largely due to the widespread use of fluoride toothpaste. Additionally, many foods and beverages are processed in areas with fluoridated water [source: CDC]. However, this raises the question: are we overexposing ourselves to fluoride? Dive deeper into this topic in the next section.

7: There's such a thing as too much fluoride

As previously mentioned, fluoride, like many minerals or natural substances, can be dangerous in excessive amounts. High levels of fluoride exposure may result in dental or skeletal fluorosis.

Dental fluorosis occurs when moderate excess fluoride is consumed during early childhood. The World Health Organization states that fluoride intake after age six does not cause dental (or enamel) fluorosis, which is characterized by tooth staining or pitting.

Prolonged exposure to elevated fluoride levels can lead to skeletal fluorosis in later life. This condition alters bone structure, causing limb deformities. Ligaments may calcify, leading to painful muscle stiffness and restricted movement.

Such physical changes are primarily observed in areas with extremely high natural fluoride levels in drinking water. While developed nations like the United States and Japan (both located in "fluoride belts") can regulate water fluoride levels to prevent harm, many fluoride belts are in impoverished regions such as Sudan, Kenya, India, and Afghanistan.

We'll revisit how fluorosis and fluoride treatment are managed worldwide in a later section. First, let's explore why fluoride has become such a contentious topic, both politically and socially.

6: Fluoride is no longer just a health issue

Fluoride has evolved into a political and social issue. While the medical and dental communities advocate for its benefits in water, opponents argue that it represents government overreach, exposing individuals to a potentially harmful substance.

Another perspective is that access to good dental hygiene isn't universal or affordable. While fluoride toothpaste and other fluoridated products effectively combat cavities, some view water fluoridation as a cost-free public health measure that could reduce the financial burden of treating cavities for families.

As with all fluoride-related debates, there's a counterargument to the economic and social perspective. Critics of fluoridation claim that overexposure disproportionately harms low-income communities, as treating fluorosis—through bleaching, micro-abrasion, or veneers—can be prohibitively expensive.

Beyond economic disparities, many fluoridation opponents view it as governmental overreach, infringing on their fundamental right to decide how to care for their bodies. It also raises concerns about parents losing autonomy over their children's health decisions.

On the next page, we'll explore why both sides of the debate appeal to the well-being of children to support their arguments.

5: Fluoride has the most effect on developing teeth

You’ve likely seen the warning on toothpaste labels advising a "pea-sized" amount for children under six, and recommending no toothpaste for kids under two. It also suggests squeezing the tube from the bottom to maximize usage.

While all these tips are helpful, the first two are crucial for preventing dental fluorosis, which occurs during early tooth development. For children aged two to six, only a pea-sized amount of toothpaste is recommended. The American Academy of Pediatric Dentistry also advises checking the fluoride levels in your water with your dentist or local water treatment facility to determine if fluoride supplements are needed.

The AAPD emphasizes supervising your child’s use of fluoride toothpaste. While most adults don’t enjoy the taste of toothpaste, children might find it appealing and accidentally swallow too much. Ensure they brush thoroughly but spit out the toothpaste afterward.

The AAPD does not recommend eliminating fluoride entirely. As discussed, the appropriate amount of fluoride effectively prevents cavities. However, in early childhood, the margin between too much and just enough fluoride is narrower. Next, we’ll explore the different sides of the fluoride debate.

4: Established medical groups fight for fluoride

While four out of five dentists might suggest sugarless gum, nearly every major dental and medical organization endorses fluoride. The list of groups advocating for optimal fluoridation resembles a child’s jumbled alphabet recital:

While all these organizations support fluoride, not all are equally enthusiastic about community water fluoridation. The EAPD notes, "for most European communities, the EAPD recommends fluoride toothpaste as the primary method... but still supports water fluoridation where feasible, as endorsed by the WHO" [source: Oulis].

Many anti-fluoridation groups are grassroots movements. Although they may have support from individual scientists, dentists, doctors, and educators, they lack the backing of major medical or dental associations.

It’s important to remember that fluoride is also a pollutant, impacting the environment. While the effects of fluoride contamination from industrial sources (or natural events like volcanic eruptions) aren’t fully understood, studies show that fluoride-treated water poses no significant environmental risk [source: Pollick].

Now, let’s shift our focus to the global perspective and explore how fluoride and its controversies are viewed differently across regions.

3: Fluoride presents different challenges around the world.

In the U.S., the fluoride debate typically revolves around the safety of adding it to water. Globally, however, the focus is often on reducing excessive naturally occurring fluoride in drinking water.

As previously discussed, excessive fluoride can cause severe skeletal fluorosis in certain parts of the world. Fluoride belts—areas with high natural fluoride levels—are often located near mountain ranges or coastal regions with mineral deposits. The World Health Organization recognizes the risks of over-fluoridation and prioritizes controlling fluoride levels in water sanitation programs.

More than half of the U.S. adjusts fluoride levels in water to reach optimal concentrations. Countries like New Zealand, Australia, and Ireland (along with 10% of Britain’s water supply) also fluoridate their water. While most European nations, Japan, and China do not fluoridate water, this doesn’t mean they oppose fluoride. Many of these countries add fluoride to table salt (similar to iodized salt in the U.S.) or even incorporate it into milk.

Fluoridating water is not universally accepted. However, if you’re convinced that fluoride should be enthusiastically added to drinking water, keep reading—even the U.S. government recently reconsidered its long-standing position on fluoride.

2: Fluoride Levels in U.S. Drinking Water have been Lowered

The U.S. has made a slight adjustment regarding fluoridated drinking water, but opponents of fluoridation shouldn’t celebrate just yet—it’s more of a minor tweak than a complete reversal.

In January 2011, the U.S. Department of Health and Human Services (HHS) and the Environmental Protection Agency (EPA) announced that the recommended fluoride level in water should be reduced from a range of 0.7 to 1.2 milligrams per liter to a fixed 0.7 milligrams per liter. This decision followed a comprehensive review by the National Academies of Science on fluoride’s effects on dental and skeletal health, which also considered the widespread use of fluoridated products in the U.S.

Here’s where it gets complicated: while HHS recommends 0.7 mg per liter, the EPA maintains an enforceable standard of 4.0 mg per liter and a secondary standard of 2.0 mg per liter. Why the discrepancy? The EPA ensures no one is exposed to excessive fluoride, while HHS focuses on providing optimal public health recommendations that maximize benefits and minimize risks [source: EPA].

While HHS advocates for the lower 0.7 mg standard, the EPA is still evaluating whether to adjust its enforceable or secondary (recommended but not mandatory) standards. In the next section, we’ll explore how fluoride can be added to or removed from water as needed.

1: Fluoride is easily added to drinking water and tough to remove

By now, you might have formed an opinion on fluoride and the ongoing debate about adding it to community water supplies. But how exactly is fluoride introduced or removed from water?

Adding fluoride is far simpler than removing it. Typically, water districts introduce fluoride (often as fluorosilicic acid, sodium fluorosilicate, or sodium fluoride) into a large saturator tank. Once the water is saturated with fluoride, it’s released into the water supply at the desired concentration.

Removing fluoride is more challenging. Standard water filters, which are usually charcoal-based, don’t affect fluoride levels because they don’t capture all chemicals. Boiling water won’t help either, as fluoride remains unaffected by heat. Reverse osmosis and distillation systems can remove fluoride, and the CDC advises using an American National Standards Institute (ANSI) certified unit proven to effectively reduce fluoride levels.

However, reverse osmosis and distillation methods can be costly for individuals and aren’t practical for entire community water systems. As the World Health Organization states, "the best solution is to locate a safe drinking water source with appropriate fluoride levels" [source: WHO].

If you’re eager to learn more about fluoride—or worried about overexposure—continue reading for additional insights into the fluoride debate.