A peer-reviewed study from Griffith University has placed Australia's long-debated sugar tax back at the centre of public health conversation, projecting that a 20 per cent levy on sweetened beverages could prevent millions of dental health crises and generate over a billion dollars for health services across the next quarter-century. The research arrives in a country where nearly one in three adults carries untreated tooth decay, and where the gap between what science recommends and what politics permits has long been wide. With 116 nations already taxing sugary drinks and the United Kingdom'
New research bolsters case for $1.4B sugar tax on Australian beverages
Approximately one-third of Australians aged 15+ currently have untreated tooth decay or cavities, with lower-income households disproportionately affected by oral health disparities.
A tax doesn't rely on individual willpower—it changes the environment.
Mark
Why does a tax on sugary drinks matter so much to dental health specifically?
Mimi
Because sugar is what bacteria in your mouth feed on. When you consume sugary drinks regularly, you're essentially bathing your teeth in fuel for decay. The tax works by making those drinks less attractive to buy, so fewer people consume them, so fewer cavities form. It's prevention at scale.
Mark
But couldn't people just choose not to drink them without a tax?
Mimi
In theory, yes. But the research shows that's not how populations actually behave. A tax doesn't rely on individual willpower—it changes the environment. When something costs more, people buy less of it. That's especially true for lower-income households, which is why the study found they'd benefit most.
Mark
The industry says this will hurt poor families. Is that a fair concern?
Mimi
It's the standard objection, but the evidence cuts against it. Poor families do spend more of their income on sugary drinks, so yes, they'd pay more. But they also have worse oral health outcomes already. A tax that reduces consumption would improve their health more than anyone else's. It's not painless, but the net effect is positive.
Mark
Why hasn't Australia done this already if other countries have?
Mimi
Politics. The beverage industry is powerful and well-organized. A 2024 parliamentary inquiry recommended it, the medical association backed it, but nothing happened. The UK did it in 2018 and it worked—sugar content in soft drinks dropped 46 per cent. But Australia hasn't moved. This new research is essentially another push to break the stalemate.
Mark
What would $1.4 billion actually fund?
Mimi
The study suggests using it to strengthen health services and create universal dental care. Right now, dental care in Australia isn't covered by Medicare the way other health services are. That money could change that—make dental care accessible to everyone, not just people who can afford it.
Mark
Is there any real chance this happens?
Mimi
There's public support for it, medical backing, international evidence it works, and a clear revenue number. But the industry opposition is real, and governments are cautious about taxes that feel regressive. It's genuinely uncertain. The research is strong, but research alone doesn't make policy.
Il Polso
- One in three Australians over 15 carries untreated tooth decay, and lower-income households bear the sharpest edge of that burden — the status quo is already costly.
- New modelling projects 3.7 million fewer tooth decay cases and half a million additional healthy life years if a 20 per cent sugar tax is introduced, giving advocates their most concrete ammunition yet.
- The Australian Beverages Council has pushed back hard, calling the tax a regressive burden on poorer families — a charge that a 2017 Deakin University study directly contradicts.
- A 2024 parliamentary inquiry has already recommended the levy, and the Parliamentary Budget Office estimates it would raise $1.4 billion in just two financial years, creating a credible funding path for universal dental care.
- With 116 countries and a proven UK model behind it, the policy is neither radical nor untested — the remaining obstacle is political will, not evidence.
A peer-reviewed study from Griffith University has placed Australia's long-debated sugar tax back at the centre of public health conversation, projecting that a 20 per cent levy on sweetened beverages could prevent millions of dental health crises and generate over a billion dollars for health services across the next quarter-century. The research arrives in a country where nearly one in three adults carries untreated tooth decay, and where the gap between what science recommends and what politics permits has long been wide. With 116 nations already taxing sugary drinks and the United Kingdom's 2018 levy having reshaped its entire soft drink market, Australia now faces a familiar human question: when evidence accumulates, what does a society owe its most vulnerable members?
A new Griffith University study published in BMJ Public Health is reigniting Australia's debate over a sugar tax, projecting that a 20 per cent levy on sweetened beverages could prevent 3.7 million cases of tooth decay, 191,000 cases of gum disease, and 115,000 cases of complete tooth loss over the next 25 years. The research uses computer-based modelling to show that for every one per cent rise in price, consumption falls by 1.2 per cent — meaning a full 20 per cent tax would reduce how much Australians drink of these beverages by roughly a quarter.
The benefits extend beyond dental health. Lead author Lennert Veerman estimates the measure would add approximately 500,000 health-adjusted life years to the 2019 Australian population over their lifetimes, driven by reductions in both oral disease and weight-related illness. The backdrop is sobering: nearly one-third of Australians aged 15 and older currently have untreated tooth decay, and oral diseases account for 2.4 per cent of the country's total health burden.
The financial case is equally compelling. A 2024 parliamentary inquiry into Australia's diabetes epidemic recommended the tax, and the Parliamentary Budget Office calculated it would raise close to $1.4 billion across two financial years — funds that could be directed toward universal dental care. International precedent is well established: the UK's 2018 sugar tax drove a 46 per cent reduction in the sugar content of soft drinks, with nearly 90 per cent of the market now falling below the taxable threshold. One hundred and sixteen countries already apply an excise on sugary beverages.
Opposition remains firm. The Australian Beverages Council has called the measure misguided and regressive, arguing it would hit lower-income households hardest. Yet a 2017 Deakin University study found the reverse — that poorer households stood to gain the greatest health benefits. The Australian Medical Association has declared itself fully in support, citing modelling that suggests thousands of diabetes cases could be prevented. Whether strong public backing and mounting evidence will be enough to overcome industry resistance is the question Australia has yet to answer.
A new study from Griffith University is reviving one of Australia's most contentious public health debates: whether the country should impose a 20 per cent tax on sugar-sweetened beverages. The research, published this week in BMJ Public Health, makes a case that has long divided policymakers and industry groups by projecting concrete health gains that would flow from such a levy.
The numbers are substantial. Over the next 25 years, a sugar tax of that magnitude could prevent 3.7 million cases of tooth decay, 191,000 cases of gum disease, and 115,000 cases of complete tooth loss across the country. Those figures emerge from computer-based simulations that model how consumption patterns shift when prices rise. For every one per cent increase in the price of sugary drinks, the research found, consumption drops by 1.2 per cent. A full 20 per cent tax passed on to consumers would translate to a 24 per cent reduction in how much of these beverages Australians drink.
The oral health benefits are only part of the story. Lennert Veerman, a public health professor at Griffith and one of the study's authors, points out that the tax would generate roughly half a million health-adjusted life years for the 2019 Australian population over their lifetimes. That gain comes not just from fewer cavities and gum disease, but from reductions in weight-related illness as people consume fewer sugar-laden drinks. The context matters: as of 2017–2018, about 9.1 per cent of Australian adults reported drinking sugar-sweetened beverages daily, while nearly one-third of Australians aged 15 and older had untreated tooth decay or cavities.
The financial argument is equally direct. A 2024 parliamentary inquiry into Australia's diabetes epidemic recommended a 20 per cent sugar tax, and the Parliamentary Budget Office calculated that such a levy would raise nearly $1.4 billion in the following two financial years, after accounting for collection costs and a drop in GST revenue. That money could be directed toward strengthening health services and implementing a universal dental care approach—a significant shift in how Australia funds oral health.
International precedent exists. The United Kingdom introduced a sugar tax in 2018, levying between 19.4 and 25.9 pence per litre depending on sugar content. The result was a 46 per cent reduction in the sugar contained in soft drinks, with nearly 90 per cent of the market now containing sugar below the threshold that triggers the tax. One hundred and sixteen countries worldwide now have an excise tax on at least one type of sugar-sweetened beverage, suggesting the policy is neither radical nor untested.
Yet the proposal remains contentious. The Australian Beverages Council, the peak body for the non-alcoholic drinks industry, has rejected calls for a sugar tax, calling it a "misguided measure" that would hit lower-income households hardest. This concern about regressive impact—that poorer families would bear a disproportionate burden—is a recurring objection. However, a 2017 Deakin University study found the opposite: those lower-income households stood to gain the greatest health benefits from a sugar tax. The Australian Medical Association, by contrast, declared itself "100 per cent behind" the proposal, with its president noting that modelling showed thousands of diabetes cases could be prevented if the country acted.
Oral disease is a growing global public health concern, affecting approximately 3.5 billion people worldwide. In Australia, oral diseases contribute to 2.4 per cent of the country's total health burden and rank among the top 10 diseases by impact. The new Griffith research arrives at a moment when public support for policies that reduce sugar intake is reportedly high. What remains unclear is whether that public backing will translate into political will—or whether the industry's resistance will prove decisive.
Citazioni salienti
A sugar tax is a population-level measure. It does not rely solely on individuals changing their behaviour but helps create an environment in which healthier choices become easier.— Marco Peres, SingHealth Duke-NUS
Our modelling shows we can prevent thousands of cases of diabetes if we act.— Steve Robson, Australian Medical Association president
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