Fluoridated Water Is Safe, Has No Impact on IQ, Brain Function

• A brand new research finds no proof that fluoridated consuming water impacts kids’s IQ or the cognitive talents of older adults.
• Specialists say fluoride in consuming water helps forestall tooth decay and cavities.
• They add that an individual’s dental well being immediately impacts their total well being.

Fluoride in consuming water doesn’t have an effect on kids’s IQ or lower cognitive talents in older adults, in line with a brand new, large-scale research.

“We discover no proof that [community water fluoridation] is negatively related to adolescent IQ or grownup cognitive functioning,” the research authors wrote.

The findings are in distinction to Well being and Human Providers (HHS) Secretary Robert F. Kennedy’s announcement in April that he would require the Facilities for Illness Management and Prevention (CDC) to revise its long-standing recommendation that fluoride be added to consuming water.

In addition they contradict earlier analysis, together with a January study, that has urged a attainable hyperlink between fluoride and kids’s IQ ranges. Researchers famous that the research had been carried out in China and different nations with greater fluoride concentrations than permitted in the US.

Scott Tomar, DMD, a spokesperson for the American Dental Affiliation, stated this analysis offers vital info for the general public at a crucial time. Tomar wasn’t concerned within the research.

“Regardless of misinformation that’s on the market, the very best out there proof signifies that neighborhood water fluoridation has no impact on IQ, cognition, or different measures of neurodevelopment,” stated Tomar, who can be a professor and affiliate dean for Prevention and Public Sciences on the School of Dentistry on the College of Illinois Chicago.

Danelle Fisher, MD, a pediatrician at Windfall Saint John’s Well being Middle in Santa Monica, CA, stated the findings verify earlier analysis on fluoridated water. Fisher wasn’t concerned within the research.

“They reassure us that the usage of fluoride in correct quantities doesn’t have any definitive results on IQ,” she informed Healthline. “It makes case for having fluoride in our consuming water.”

The brand new research was led by Rob Warren, PhD, a sociologist and inhabitants well being skilled on the College of Minnesota.

Warren used knowledge from the Wisconsin Longitudinal Study, which has adopted greater than 10,000 folks in that state since they graduated from highschool in 1957. Contributors took IQ checks at age 16, then had cognitive testing carried out at ages 53, 64, 72, and 80.

The unique goal of the Wisconsin research wasn’t targeted on fluoride so there was no knowledge out there on urine or blood checks that may have measured precise ranges of fluoride. Warren’s group based mostly their estimates on publicity from information of when neighborhood water fluoridation started in sure areas.

The brand new findings observe a November 2025 study led by Warren that discovered no hyperlink between neighborhood water fluoridation in youth and mind operate in folks at age 60.

Specialists observe that fluoridation at acceptable ranges doesn’t seem to trigger any destructive well being results.

“On the ranges of fluoride that we use for neighborhood water fluoridation in the US and different nations, there aren’t any adversarial well being results,” Tomar informed Healthline.

Graham Tse, MD, a pediatrician and chief medical officer of MemorialCare Miller Kids’s & Ladies’s Hospital in Lengthy Seashore, CA, agreed that the low ranges of fluoride in U.S. consuming water pose no menace. Tse wasn’t concerned within the research.

“There isn’t any proof of any well being impacts,” Tse informed Healthline.

He added that fluoride, like nutritional vitamins or different substances, can pose some points if persons are uncovered to excessive ranges. “That’s the case with many, many issues,” Tse stated.

The well being advantages of fluoride in consuming water had been first studied in 1909 in Colorado.

In 1945, Grand Rapids, Michigan, turned the primary state so as to add fluoride to its municipal water in an effort to assist forestall tooth decay. Preliminary research reported that tooth decay amongst Grand Rapids schoolchildren born after 1945 had declined by 60%.

In 1962, the U.S. Public Well being Service recommended fluoridation in consuming water.

The CDC states that the optimum degree of fluoride in consuming water to stop cavities is 0.7 milligrams (mg) per liter (L). That quantities to three drops in a 55-gallon barrel. The legal limit for consuming water in the US is 4 mg/L.

As we speak, greater than 70% of individuals in the US on public water methods obtain fluoridated water. That represents greater than 200 million People.

Nevertheless, that quantity is shrinking. Two states — Utah and Florida — have enacted bans on fluoride in consuming water. A number of different states, together with Kentucky, Louisiana, Missouri, and Oklahoma, have pending laws to restrict fluoride.

Fluoride, a chemical present in nature in addition to in toothpaste and consuming water, works by inhibiting the expansion of micro organism that trigger cavities, strengthening the laborious outer enamel of enamel, reversing the harm brought on by cavities, and supporting new bone formation.

Extreme fluoride consumption, nonetheless, could trigger fluorosis, a situation that can lead to white spots or brown stains on enamel.

Specialists say the advantages of fluoridated water are quite a few and widespread.

“Now we have extraordinarily constant proof that water fluoridation helps to stop tooth decay and reduces its severity,” stated Tomar. “We even have very constant proof that neighborhood water fluoridation saves cash for households, communities, and state governments by decreasing dental prices and missed days of labor or college as a result of dental issues.”

“The first hazard of stopping fluoridation is that the degrees of tooth decay, and its associated therapy prices will enhance,” he added. “The consequences present up first – and most pronounced – among the many youngest kids locally however finally impacts everybody.”

Amongst different points, gum disease can have an effect on blood sugar ranges in folks with diabetes and enhance the danger of coronary heart illness and respiratory infections.

As well as, poor dental well being may also result in the development of diabetes and different continual illnesses later in life.

Poor dental well being can also affect folks with continual kidney illness.

Fisher stated that cavities can result in abscesses and infections, which might have an effect on any a part of the physique.

“Cavities aren’t simply little holes in your enamel,” she informed Healthline. “Infections can unfold and trigger all kinds of issues.”

“Oral well being isn’t restricted to the mouth,” Tse famous. “It’s related to total well being.”

CDC officers say there are a number of ways you possibly can promote good oral well being. Amongst their recommendations:

• Keep away from meals and drinks with added sugars.
• Drink fluoridated water and use fluoridated toothpaste.
• Brush your enamel not less than twice a day and floss commonly.
• Go to the dentist not less than yearly.

Fisher agreed with these suggestions and added a number of extra recommendations for fogeys.

She stated adults ought to set instance for youngsters on common brushing and flossing. She provides that oldsters ought to keep away from giving kids too many drinks and meals with added sugars.

Fisher stated infants ought to by no means go to sleep whereas consuming juice or soda from a bottle. That enables sugar to coat their tiny enamel. She added that gummy merchandise may also keep on with enamel and must be used sparingly.

Tse agreed that good dental habits are vital for youngsters, as their enamel are nonetheless rising. He stated that if everybody had entry to high quality dental care and adhered to wholesome dental habits day-after-day, then maybe fluoridated water wouldn’t be crucial.

“Perhaps we wouldn’t want fluoridated consuming water underneath these circumstances, however that’s not the truth,” he stated. “Fluoridation is an inexpensive, efficient technique to promote good dental care.”