hardy limeback (@DrLimeback) header
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Professor Emeritus, former Head of Preventive Dentistry, University of Toronto. Licensed dentist for 37 years. Fluoridation is unsafe, ineffective & immoral.

Toronto
Joined October 2009
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hardy limeback retweeted
New study finds fluoridation chemicals are linked to "DNA and chromosomal damage in mammalian cells." "these findings indicate that FA [fluorosilicic acid] can impair cell proliferation and induce chromosomal damage in mammalian cells, while also causing toxicity in C. elegans [an organism used to study genetics] at concentrations encountered in environmental exposure. These results highlight the need for further studies to clarify the long-term effects of FA exposure and assess their relevance to current fluoridation practices." sciencedirect.com/science/ar… Why wait. Stop fluoridation. There's no evidence that the fluoridation chemical NYC uses is safe. @BobHoldenNYC @CMCrystalHudson @CMDMCarr @CMJulieWon @CMKevinCRiley @CMLindaLee @CMNantashaW @CMPiSanchez @CMShahanaHanif @CnDelarosa @Helen4NYC @InnaVernikov @JackHites @JenGutierrezNYC @JoannAriola32 @JoeBorelliNYC @KalmanYeger @KeithPowersNYC @KristyMarmorato @LincolnRestler @LindaLeeforNYC @OsseChi @SandyforCouncil @SusanZhuangNYC @VickieforNYC @ebottcher @errollouis @voteshekar @JimGennaro @AndyKingNYC @CMDebiRose @CMKoslowitz @CMPeterKoo
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In a united Ireland will the six counties of former Northern Ireland be subject to the Republic's 1960 mandatory water fluoridation law? Chemifloc Ltd. imports Fluorosilicic Acid from Spain and distributes it to water treatment works: see below 👇 Irish News, July 30, 2026 👇
In 1996 Ed Storey, the then boss of Chemifloc Ltd., wrote to me in Derry that there should be "No Surrender to the pure water Lundys" and that "young men will walk the walls of the Maiden City with teeth like movie stars". irishexaminer.com/business/a…
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If your town fluoridates it will spend your tax dollars to seek out and buy this poison for the people to drink.
NEW STUDY - A Safety Assessment of Fluorosilicic Acid Used for Water Fluoridation A new toxicological assessment of fluorosilicic acid was done to investigate the cytotoxic, genotoxic, and mutagenic effects of fluoridation chemicals using concentrations seen at common environmental exposures. Highlights •Fluorosilicic acid induced DNA and chromosomal damage in mammalian cells. •No mutagenic activity was detected in the bacterial reverse mutation assay. •Developmental and behavioral toxicity was observed in Caenorhabditis elegans. •Findings support environmental hazard assessment of water fluoridation chemicals. "Taken together, these findings indicate that FA can impair cell proliferation and induce chromosomal damage in mammalian cells, while also causing toxicity in C. elegans at concentrations encountered in environmental exposure. These results highlight the need for further studies to clarify the long-term effects of FA exposure and assess their relevance to current fluoridation practices."
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Why was Keir Starmer ousted and Andy Burnham installed as Prime Minister?
WHY did Morgan McSweeney need Peter Mandelson to be UK Ambassador to the USA at that time? What looming US-UK policy divergence was the Prince of Darkness there to influence? Why has Trump's White House not yet advised all US water systems to stop fluoridation?
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"If you know the enemy and know yourself, you need not fear the result of a hundred battles." Sun Tzu, "The Art of War"
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Voluntarily feeding a poison the people. Is this the definition of insanity? PS: It is tasteless and odorless.
UPDATE - "The utility that provides public water to parts of Anson, Madison and Embden has resumed putting fluoride in its water, a month after an apparent equipment malfunction led to high levels of the additive and a “do not drink” order. Meanwhile, the Anson-Madison Water District’s elected trustees have suggested its three member municipalities call for a vote on whether to continue the longstanding practice of fluoridating the water supply. Officials in at least one have already taken steps to get the question on the ballot next year."
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Our latest Fluoridation Review is out. Here are the highlights: * Water Fluoride Associated With Lower Nonverbal Reasoning, Spatial Processing in USA * Washington State Petition Would Require Notice on Prenatal Fluoride Exposure * Fluoride Exposure Associated With Reduced Size of Thyroid Gland * Animal Studies Associate Fluoride Exposure With Reduction in Concentrations of Needed Metal Nutrients and Increase in the Concentrations of Toxic Metals * Dentist Advises Endurance Athletes to Drink Non-Fluoridated Water
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hardy limeback retweeted
Civil Rights Leaders Urge Dr. Oz and the National Kidney Foundation to Oppose Water Fluoridation, based on risk to kidney patients. UN Ambassador Andrew Young’s father and brother were dentists, and he once supported fluoridation. He writes that he changed his mind as evidence grew that ingested fluoride affects organs well beyond the teeth. He frames the issue as one of civil rights and fairness. nidellaw.com/andrew-young-le… Rev. Dr. Gerald L. Durley writes: “The Silence Is Deafening” In an October 2026 letter to the National Kidney Foundation’s leadership the Rev. Dr. Gerald L. Durley added his voice. He writes that he has a dear friend on dialysis and receives the Foundation’s mailings, yet has never seen a warning that kidney patients are especially susceptible to fluoride. He notes that the federal government has acknowledged this in reports since at least the 1990s, and that the Foundation’s own website says fluoride must be filtered out of dialysis water because people have been injured or have died when it was not. Comparing fluoridation to cigarettes and leaded gasoline, practices once accepted and later abandoned, he asks the Foundation to issue a public statement opposing water fluoridation and to “be on the right side of history.” nidellaw.com/wp-content/uplo… Why Kidney Patients Are at Particular Risk Ambassador Young’s letter points to the National Research Council’s identification of kidney patients, diabetics, and seniors as “susceptible subpopulations” who are especially vulnerable to fluoride. The kidneys are the body’s main route for clearing fluoride. When they are impaired, fluoride can build up in the body. Both letters highlight a contradiction. Water used in dialysis machines is filtered to remove fluoride, yet dialysis patients go home and drink fluoridated tap water. Many cannot afford a home filtration system, and many may not know about the risk. Ambassador Young also highlights who bears the burden. Kidney disease now affects roughly 1 in 7 American adults. Black Americans make up about 13% of the population but more than 35% of dialysis patients, and Latino communities are also disproportionately affected. He argues that people in susceptible groups should be warned clearly and publicly, and that economically disadvantaged families should not bear the cost of avoiding fluoride. Fluoride Harm Is Not Only Cosmetic As both letters underscore, the concern does not stop at the teeth [dental fluorosis]. Researchers continue to study fluoride’s effects on the kidneys, bones, thyroid, and brain. nidellaw.com/wp-content/uplo… @NYCMayor @MayorApplyrs @AOC @AlbanyNYLeg @albanywater @ALBCouncil @DustinReidy @michaelallain @RichardConti2 @tabetha4albany @meredithleighstoever @ReinventAlbany @RamLalukota @AlbanyNewz @melissadderosa @empirereportny @db_galin @AlbBlackChamber @JeffLewisNY @andrewneidhardt @brown_weinraub @jmirandolam @KathleenSkeals @FoilCorruption @legmajorityalb @BobCohen1 @PaulGrondahl @APHealthScience @mikestobbe @kp224 @GovKathyHochul #publichealth #kidney @nkf #dialysis
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UPDATE: During the October 13th meeting, Cheney City Council members voted to defer the fluoridation vote to a future council meeting to get additional financial information about making a switch.
WASHINGTON STATE - Cheney city council is voting tonight, Tuesday, October 13, on whether to end fluoridation. The meeting starts at 6pm pacific time and is open to the public. FAN contacted the mayor and city council expressing support for ending fluoridation in Cheney. Big thanks to everyone in Safe Water Spokane and throughout Washington who also took the time to write. If you are in Cheney or in Washington, there's still time for you to chime in.
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hardy limeback retweeted
Organized dentistry lobbied many states, including NYS, to put a fluoridation protection law on the books usurping local control. It requires 90 days notice to stop fluoridation, but not start it, so pro-fluoridationists can have enough time to notify and activate their troops, PR people and dental societies to descend on the locality to intimidate them into reversing their stop-fluoridation decision infringing on its right to control its own water supply. New York State legislators fell for it legislation.nysenate.gov/pdf… and so did Washington state. This puts Cheney, Washington, in a difficult situation. They want to stop fluoridation but have to wait until costs of repairing or replacing equipment is figured out. They fear the 90 days will run out before they know that information. What's the penalty? krem.com/article/news/health… A previous NYS dental director, working with the American Dental Association, successfully added a similar law into the 2020/2021 budget, which few legislators read. It's here nysenate.gov/legislation/law… More about that here: fluoridedangers.blogspot.com… This law protects organized dentistry because fluoridation is their ticket to political viability. Legislators should be protecting constituents not the American Dental Association. But the latter has deep pockets filled with corporate cash and my side only has the truth. Three New York State counties and many NYS cities and towns have stopped or rejected fluoridation. Many never even considered it. NYS DoH statistics show fluoridation isn't linked to less tooth decay and hasn't closed the disparity gap. Who were the powerful lobbyists paid by organized dentistry that made this happen with no evidence that fluoridation is safe and effective? @nydems @NYS_AM @NYSA_Majority @NYSenate @FredThiele1 @AssemblymanD @SteveEngles @DougSmithNY @PhilRamos6AD @GandolfoForNY @LegSteveStern @SteveSternNY @Kimjeanpierre @CharlesLavineNY @AssemblymanDGM @AsmMontesano @ginasillitti @JohnMikulin @IamTDarling @EdwardRa19 @MissyMillerNY @judygriffinny @MichaelleSolage @Stacey23AD @DavidWeprin @nily @edbraunstein @LindaBRosenthal @AndrewHevesi @AliciaHyndman @Barnwell30 @KhaleelAnderson @clydevanel @votejgr @JeniferRajkumar @MikeStobbe @RonanFarrow
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hardy limeback retweeted
"Exploring the Impact of Fluoride in Drinking Water: Health Implications, Biological Mechanisms, and Worldwide Fluorosis Distribution" (Journal of Indian Association of Public Health Dentistry) CONCLUSION AND RECOMMENDATIONS "There is a wide range of studies recommending fluoridation for better oral health and there are even more studies revealing hazardous health effects of fluoride. However, it is evident from the study that the adverse effects of fluoride outweigh the beneficial effects" "presently fluorosis is most prevalent in less developed countries compared to developed ones in which fluorosis if observed at all can be ascribed to artificial fluoridation predominantly." Highly exposed individuals are also susceptible to numerous health manifestations such as osteoporosis, arthritis, brittle bones, cancer, infertility in women, brain damage, thyroid disorders, and so on" "Fluorosis, apart from exposure to contaminated water and other dietary sources, depends on the age, weight, nutrition status, and physical activity of individuals. Most of these factors generally depend on the socioeconomic conditions of people. Although the health effects of fluoride have now been known for almost a century, there is still a lack of awareness among the masses" "fluorosis can also be caused by other sources of fluoride such as volcanoes, coal smoke, and artificial fluoridation." Fluorosis in humans is often ignored and confused with other health effects. In the human body, fluorosis has different manifestations ranging from dental defects, bone deformities, impaired functioning of certain key organs and even dreadful conditions like cancer. These manifestations and their severity vary from one individual to other and depend on major factors such as total intake, duration of exposure, response, body weight, nutrition of individual and physical activities including the altitude of residence. Depending on the affected system in the human body, health effects of fluoride can be classified into three broad forms, i.e., dental fluorosis, skeletal fluorosis, and non-skeletal fluorosis." ovid.com/jnls/aphd/pdf/10.41…
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hardy limeback retweeted
A poster replied that Grok told him that I was wrong to inform @SherylNYT that fluoridation chemicals are industrial waste product. So I corrected him but he blocked me (that usually happens when fluoridationists are wrong) I didn't want the time I used to create this post to be wasted. So here it is. Per Allied Chemical which sells hydrofluosilicic acid used for water fluoridation Where the fluoride actually comes from Here is the fact that reframes the whole story: nobody builds a plant to make fluorosilicic acid. It is recovered from the off-gas of fertilizer manufacturing, and the EPA’s own supply-chain profile lays out the chemistry in two steps. Phosphate rock is mostly fluorapatite, and it carries roughly 3 to 4% fluoride. The primary reaction is the wet process — the same digestion of rock with sulfuric acid that makes phosphoric acid for fertilizer, and that produces an enormous quantity of gypsum as well During that reaction the fluoride and the silicon in the rock are mobilised and leave as gases: silicon tetrafluoride and hydrogen fluoride. Those vapours are captured, and when they are scrubbed with water the second reaction happens in the scrubber itself Two consequences of being a scrubber product. First, the output is set by how much fertilizer someone else decided to make — not by how much fluoride water systems need. Second, it is not even a clean single compound: the EPA notes, citing AWWA, that fluorosilicic acid “is not a discrete compound, but rather an aqueous mixture of fluorosilicated compounds.” The EPA’s own profile describes the material as forming “as a waste stream” when the gases are scrubbed. So the chain runs: sulfur becomes sulfuric acid, sulfuric acid digests phosphate rock, the rock gives up its fluoride as gas, the gas is scrubbed into fluorosilicic acid, and a tanker truck takes it to a water treatment plant. Every link in that chain is somebody else’s business decision until the last one. alliancechemical.com/blogs/n… The end product is allowed to contain traces of lead, arsenic and other toxins never purified out before being added to drinking water. See: lf-public.deq.utah.gov/WebLi… @Kellen_Browning @RoseLundyyy @mainemonitor @INN @mepwight @JoeLawlorPPH @FOX23Maine @WGME @WABI_TV5 @newscentermaine @RepLoisFrankel @brown_weinraub @RonanFarrow @MotherJones #oralhealth #teethmatter #dentistry #pediatrics
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A surprising turn of events. comptroller.texas.gov/about/… First Florida then Utah seems Texas be next? Every city uses HFSA (H2SiF6) from the smokestacks of phosphate fertilizer plants. It's criminal. This movement is spreading across all of 🇺🇸&🇨🇦. It's the death of fluoridation.
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Britain's Uniparty puppet politicians and client journalists are silent as toxic waste Fluorosilicic Acid from Israel's phosphate fertiliser industry is dumped in England's tap water - and the @UKLabour Government is making more public water supplies available for its disposal.
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Stop fluoridation!
BREAKING: A new U.S. study of over 2,500 kids across 23 states, led by a multi-center team of scientists, reports that fluoride in public drinking water during pregnancy is linked to lower cognition scores in children —even at levels considered "optimal" for dental health. The U.S. remains the most fluoridated nation on Earth. It's time for that to change. @SecKennedy @DrJBhattacharya pubmed.ncbi.nlm.nih.gov/4259…
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hardy limeback retweeted
China is the biggest exporter of fluoridation chemicals (hydrofluosilicic acid) Then Israel, Poland, Germany and Malaysia "News coverage also pointed at the closure of the Strait of Hormuz and disrupted shipping. That framing is worth a caveat: the China-to-North-America ocean route does not pass through Hormuz, so the most defensible link is not a single blocked shipping lane but the combination of a top-two producer going dark, war-driven freight and insurance costs, and a market that was already seasonally tight. For an industrial buyer, the lesson is the same either way — HFS supply is concentrated in a handful of producers, and a single geopolitical event can take a meaningful share of it offline overnight alliancechemical.com/blogs/a…
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hardy limeback retweeted
Sr. McCullough is still a practicing doctor. A politically motivated action took away hospital access. The Allison Inquiry in Canada and Congressional Hearing in the US prove he spoke the Truth to Power, not lies.
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Health Canada and Public Health Agency of Canada through willful neglect during the viral outbreak and COVID-19 vaccine debacle have lost all trust. This inquiry is the first step in a long corrective course. @AllisonInquiry @DeanAllisonMP @Shawnbuckleylaw @NCICanada @Inquiry_Canada @VaccineChoiceCA @canary_covid @susyq969 @Canadians4Truth @GoTalkTruth @JasonLavigneAB @riseupcan @DanDicksPFT
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WISCONSIN - City Council Votes to Remove Fluoride from Two Rivers Drinking Water "The Two Rivers City Council voted 7 to 2 Tuesday night to discontinue the addition of the mineral to its public water. City Manager Kyle Kordell said the conversation began in July. "It's hard to answer these questions about why do you do it this way, why do you put fluoride in the water and the real answer is because we've always done it this way. So we thought it was time for a fresh decision." City Council Member Katherine Dahlke said she is hearing safety concerns from residents. "There has been a growing reaction from the citizens of Two Rivers saying we don't want this in our water anymore," Dahlke said. The discussion is growing across Wisconsin and nationwide. Last year, Utah became the first state to ban fluoride statewide. In Wisconsin, only about 30% of municipalities add fluoride to their water, according to the DNR."
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hardy limeback retweeted
Benton Harbor, Michigan, refuses repeated attempts to re-start water fluoridation archive.is/15uKG City commissioners unanimously voted against the request from the Michigan Department of Environment, Great Lakes & Energy (EGLE) that the city resume adding fluoride. "no one has given commissioners an explanation on why fluoride should be added." "the city has not heard from any of EGLE's scientists or doctors about fluoride in drinking water."
UPDATE - "Benton Harbor city commissioners voted Tuesday night not to go back to adding fluoride into the city's drinking water. Benton Harbor ceased the practice a couple years ago while replacing its lead pipes."
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