Existing water fluoridation programmes in England still provide savings for the NHS – but there is no guarantee new schemes would continue to do so.
This is according to a new study led by University of Manchester researchers.
The largest ever study of the effects of water fluoridation on the dental health of adults, it estimated the public sector saved £16.9 million between 2010 and 2020 as a result of water fluoridation.
These findings were the result of a National Institute for Health and Care Research funded data study of 6.4 million UK adults and adolescents across England.
People receiving optimally fluoridated water in the study experienced a 3% reduction in NHS invasive dental treatments such as fillings and extractions.
They also experienced a 2% reduction in the numbers decayed, missing and filled teeth, when compared to the non-optimally fluoridated cohort over 10 years.
Prevention
According to the research team, there was no compelling evidence that water fluoridation reduced social inequalities in dental health. The numbers of missing teeth between the cohorts were the same.
Around six million people in England live in areas that receive drinking water with fluoride added to prevent tooth decay, including those in Birmingham and Newcastle. Water containing enough fluoride to prevent tooth decay is known as ‘optimally fluoridated’.
Over the 10-year period studied, optimal water fluoridation cost £10.30 per person. NHS treatment costs were £22.26 lower per person (5.5%) and patients paid £7.64 less (2%) in dental charges.
Using the data, the researchers estimate if 62% of the adults and teenagers in England attended NHS dental services at least twice within 10 years, the total return on investment would have been £16.9 million between 2010 and 2020.
The findings also echo the recently published NIHR CATFISH prospective cohort study in UK children.
‘Small positive health effects’
Lead author Deborah Moore is an honorary lecturer at The University of Manchester. She said: ‘This study is the first in the UK to capture health and economic effects of water fluoridation on adults with widespread access to fluorides in toothpastes, mouthwashes and dentist-applied varnishes.
‘The patients who received optimal water fluoridation had very small positive health effects.
‘But as the costs of NHS dentistry are much higher than the costs of water fluoridation, the relatively small observed reductions in visits to the dentist still resulted in a positive return for the public sector.
‘This return should be evaluated against the projected costs and lifespan of any proposed capital investment in water fluoridation, including new programmes.’
The capital costs of setting up a new scheme covering a similar number of people in 2009 have been estimated at around £50 million in today’s prices. The researchers say this will take 30 years to recover in NHS dental treatment savings.
Cost-recovery for new schemes, they add, may not be guaranteed in future generations, as children’s teeth are in much better condition than their parents’, and they may not need as much dental treatment as they reach adulthood.
Limit reached
Dr Moore added: ‘Fluoridation of drinking water is justifiably recognised as one of the twentieth century’s greatest public health achievements.
‘But as fluoride toothpastes became available in the mid-1970s – considered to be the key factor in the dramatic decline in the prevalence and severity of dental decay – the context of water fluoridation has changed.
‘There is no doubt that population-level, mass preventive interventions for tooth decay are still required.
‘Tooth decay remains almost universal by adulthood, even in populations that have had access to fluoride toothpastes and fluoridated water from birth.
‘However, in high income countries, we may be reaching the limit of what can be achieved through fluorides alone.
‘The relationship between sugar consumption and tooth decay is very clear: average consumption of sugars in the UK is more than double the recommended level for adolescents, and is almost double for adults.
‘Managing sugar consumption is another area of policy that needs to be investigated.’
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