Hawaii is a state that prides itself on well-being. The islands consistently rank among the healthiest in the nation on measures like life expectancy, physical activity, and overall quality of life. But behind that reputation lies a troubling exception — one that falls hardest on the youngest residents. When it comes to children’s oral health, Hawaii isn’t a leader. It’s ranked last.
According to the State Health Department’s oral health report, 71 percent of Hawaii’s third-grade children have experienced dental cavities. That figure sits 19 percentage points above the national average of 52 percent, making Hawaii the state with the highest prevalence of tooth decay in children in the entire country. For a state with so much to celebrate about its health culture, this statistic is a striking anomaly — and understanding why it exists, and what needs to change, is essential for every family in the islands.
The Scale of the Problem
Third-Grade Tooth Decay Rates
When researchers examine a state’s oral health, third graders are often the benchmark population. By that age, children have a mix of baby teeth and newly erupted permanent teeth, they’re old enough to participate in school-based screenings, and their dental health reflects years of cumulative risk factors — diet, hygiene habits, access to preventive care, and fluoride exposure. What Hawaii’s third-grade data reveals is sobering.
Not only do 71 percent of third-graders in the state show evidence of cavities, but roughly 22 percent have untreated dental caries — cavities that have developed and been left without treatment. And within that group, approximately 7 percent of children need urgent dental care due to infection, pain, or both. These are not minor inconveniences. Untreated tooth infections in children can interfere with sleep, concentration, eating, and school performance. In severe cases, dental infections spread and become genuinely dangerous.
The Consequences of Untreated Decay
Tooth decay in children is rarely just a tooth problem. Pain from an untreated cavity disrupts a child’s ability to focus in class, eat comfortably, and sleep through the night. Children with significant dental pain are more likely to miss school days and less likely to perform at their academic potential. For children who need urgent dental treatment, the path to care often involves emergency room visits — an expensive, inefficient, and traumatic route to care that addresses immediate pain but does little to prevent future problems.
The psychological impact matters too. Children who grow up with visible tooth decay or who experience dental pain early develop anxiety around dental care — anxiety that can persist into adulthood and lead to the very cycle of avoidance that makes dental problems worse. Breaking this cycle requires addressing the root causes rather than simply treating the downstream consequences.
Hawaii’s National Ranking
The Pew Charitable Trusts, which produces regular report cards on state children’s dental health policies, gave Hawaii an F rating. For a state with otherwise strong health outcomes, this failing grade reflects a specific and addressable gap: the near-total absence of community water fluoridation, combined with insufficient preventive dental infrastructure for children, particularly in lower-income and rural communities.
Understanding Fluoride and Why It Matters
How Fluoride Protects Teeth
Fluoride is a naturally occurring mineral that has a well-documented and extensively researched role in preventing tooth decay. Its primary mechanism is remineralization: when the acids produced by bacteria in the mouth begin breaking down tooth enamel, fluoride helps rebuild and strengthen that enamel before the damage becomes a cavity. Fluoride also makes enamel more resistant to future acid attacks, essentially fortifying the tooth’s outer layer against the ongoing challenge of daily eating and drinking.
The protection fluoride offers is not theoretical. Decades of research and public health experience have demonstrated its effectiveness across large populations. The Centers for Disease Control and Prevention named community water fluoridation one of the ten greatest public health achievements of the 20th century — placing it alongside vaccines, motor vehicle safety improvements, and infectious disease control as a defining advance in population health.
The American Dental Association, the World Health Organization, the American Academy of Pediatrics, and dozens of other major health organizations all endorse community water fluoridation as safe, effective, and one of the most cost-efficient public health measures available. The optimal fluoride level in drinking water — currently recommended at 0.7 milligrams per liter — is carefully calibrated to provide maximum dental benefit while remaining well below any level that could cause harm.
The Cost-Effectiveness Argument
Beyond the health benefits, the economics of water fluoridation are compelling. Studies have consistently found that every dollar invested in community water fluoridation saves many more in reduced dental treatment costs. Senator Karl Rhoads, who has sponsored legislation to require fluoridation of Hawaii’s public water systems, cited estimates that in a large system like Honolulu’s, fluoridation can save up to $32 in reduced dental costs for every dollar spent on the program. Across an entire state, those savings accumulate rapidly.
The inverse also holds. States with low fluoridation rates spend more — far more — on the downstream consequences of untreated tooth decay: emergency room visits for dental pain, Medicaid-funded restorative dental procedures, and the indirect costs of lost school and work days. Hawaii’s high rates of childhood tooth decay are not just a health problem; they represent significant economic costs that fall disproportionately on public health systems and the families least able to absorb them.
Hawaii’s Fluoridation Landscape
The Least-Fluoridated State
Despite the strong scientific consensus on the benefits of fluoride, Hawaii is the least-fluoridated state in the country. Only about 11 percent of the state’s water supply is fluoridated — meaning that fewer than 160,000 people out of a population of more than 1.4 million residents have access to fluoridated community water. By comparison, more than 73 percent of Americans on public water systems receive fluoridated water.
The disparity is stark. Most of the fluoridated water in Hawaii serves military housing and installations; no county in the state currently fluoridates its civilian drinking water. This means that the vast majority of Hawaii’s families — including the children who are already experiencing the highest cavity rates in the nation — are not receiving one of the most effective and passive forms of dental protection available.
It is worth noting that fluoride naturally occurs in water at varying levels depending on the water source. Some areas of Hawaii have naturally occurring fluoride in their water at low levels, but not at the concentration needed to provide the dental protective effect that community water fluoridation achieves. The difference between trace naturally occurring fluoride and optimally adjusted fluoride is meaningful in terms of real-world cavity prevention.
Resistance to Fluoridation
Hawaii’s resistance to community water fluoridation has persisted for decades despite the evidence in favor of it and the clear need. Opposition has come from various quarters — concerns about adding any substance to drinking water, questions about individual choice, and skepticism about government health recommendations among them. Some community members have raised questions about fluoride safety, despite the extensive research establishing the safety of fluoridated water at recommended levels.
This resistance has real consequences. While debates continue, children are experiencing tooth decay at rates that lead the nation. The gap between what the evidence supports and what the state has implemented represents a policy failure that shows up directly in the dental health outcomes of Hawaii’s children.
The Legislative Push for Change
Senator Rhoads and Water Fluoridation Legislation
Democratic state senator Karl Rhoads has been among the most vocal advocates for addressing Hawaii’s fluoridation gap through legislation. He has sponsored bills that would require significant public water suppliers in Hawaii to fluoridate the state’s drinking water, pointing to the children’s dental health data as a clear mandate for action.
In public statements, Senator Rhoads has been direct about both the problem and the solution. He has noted Hawaii’s lowest-in-the-nation ranking on children’s dental health and emphasized that water fluoridation is a proven, widely used public health tool. “Fluoridation is a system that is used all over the country and the world that reduces cavities if you drink water that is fluoridated,” he said in an interview with KITV-TV.
Proposed legislation has included provisions for the Hawaii Department of Health to reimburse water suppliers for the initial infrastructure costs of implementing fluoridation, provide technical training and assistance, and submit regular reports to the state legislature on the program’s implementation and outcomes. These provisions address some of the practical concerns of smaller water systems and acknowledge that the upfront investment, while modest, represents a real consideration for community water suppliers.
What Fluoridation Legislation Would Mean
If comprehensive water fluoridation legislation were passed and implemented in Hawaii, the practical impact would be substantial. The majority of the state’s population that currently lacks access to optimally fluoridated water would gain passive, daily protection against tooth decay — without needing to take any additional action or purchase any supplemental fluoride products. Children who currently lack this protection would receive it automatically, leveling a playing field that currently tilts against lower-income families who may have less access to other preventive dental care.
Public health modeling suggests that even modest improvements in fluoridation coverage translate to meaningful reductions in cavity rates over the following decade. For a state that currently leads the nation in childhood tooth decay, closing the fluoridation gap would be among the highest-impact single steps available.
Beyond Fluoride: What Families and Communities Can Do Now
The Fundamentals of Daily Oral Care
While the policy debate over water fluoridation continues, families cannot afford to wait. The basics of oral hygiene remain essential and effective, even in the absence of fluoridated tap water.
Brushing twice daily with a fluoride toothpaste is the single most important step any family can take to prevent cavities. For young children, parents should be actively brushing or supervising brushing until around age seven or eight, when kids develop the dexterity to do it effectively on their own. A pea-sized amount of fluoride toothpaste on a soft-bristled brush, used in the morning and before bed, is the daily foundation of cavity prevention.
Flossing daily removes plaque and food particles from between the teeth — surfaces that a toothbrush can’t reach and where cavities often begin. For young children, parents can use floss picks or child-friendly flossers to make the process easier and more consistent.
Regular Dental Visits
The American Dental Association recommends visiting the dentist at least twice a year for preventive care. These visits serve multiple purposes: professional cleaning removes plaque and tartar buildup that brushing at home can’t address, the dentist can identify early signs of decay and address them before they become larger problems, and fluoride treatments applied in the dental office provide an additional layer of protection.
For children who aren’t receiving fluoride through their water supply, in-office fluoride treatments are especially important. Fluoride varnish applications, which can be applied in minutes during a regular checkup, significantly reduce the risk of new cavities and are safe for children of all ages.
Overcoming Dental Anxiety
Fear of the dentist is a genuine barrier for many families. Roughly 22 percent of American adults avoid dental care due to anxiety, and these patterns often trace back to difficult childhood experiences in the dental chair. This avoidance is self-reinforcing: the longer someone stays away from the dentist, the more likely it is that a problem will have developed by the time they do go, and the more involved and potentially uncomfortable that treatment becomes.
For children, early positive dental experiences are the best antidote to dental anxiety. When a child’s first dental visit happens before any problem has developed — ideally by age one, as pediatric dentistry guidelines recommend — it becomes a routine, low-stakes event rather than a fear-provoking response to pain. Pediatric-friendly dental offices with child-centered environments, gentle communication, and distraction techniques help make dental care something children can tolerate and eventually not dread.
For adults with established dental anxiety, open communication with a dental provider about fears allows the dentist to adjust their approach — explaining each step, using gentler techniques, or in some cases offering sedation options for patients who need them to receive necessary care.
Supplemental Fluoride
For families in Hawaii who are concerned about the lack of fluoridated tap water, supplemental fluoride options are available. Dentists can prescribe fluoride supplements for children — drops or tablets — that provide systemic fluoride exposure during the years when teeth are still developing. Fluoride mouth rinses are available over the counter for older children and adults. And consistent use of fluoride toothpaste, twice daily, ensures that teeth receive topical fluoride protection with every brushing session regardless of what’s in the water.
A Shared Responsibility
Hawaii’s position at the bottom of national childhood dental health rankings is not inevitable, and it is not permanent. It reflects a specific, identifiable gap — most significantly, the near-total absence of community water fluoridation — combined with disparities in access to preventive dental care that fall hardest on the families with the fewest resources to address them.
The solution requires action at multiple levels simultaneously. Families need to maintain consistent oral hygiene habits and keep up with dental visits. Communities need to support access to preventive dental care, especially for children. And lawmakers need to close the fluoridation gap that has left more than a million Hawaii residents without a protection that the rest of the country has largely taken for granted for generations.
The keiki of Hawaii deserve healthy smiles. Getting there will require everyone — families, providers, and policymakers — doing their part.