It was revealed that there is evidence that fluoride in drinking water is responsible for bone and bladder cancer. In addition to this, it was also revealed that it also lowers IQs in the general population.
Stephen Peckham, professor of health policy at the centre for health service studies at Kent University, said the process was introduced before there was enough research to demonstrate its safety and effectiveness.
He told The Guardian: ‘It’s a dental health policy that’s got up a head of steam and people have been reluctant to see it criticised.
‘You can’t really confidently say that water fluoridation is either safe or effective. There is a problem where the evidence is seen as either totally in favour or totally negative and it’s more murky than that.’
Prof Peckham has led research into whether hyperthyroidism – which can cause anxiety, sleeping problems and muscle weakness – is linked to fluoridation but said there are problems with evidence on both sides of the argument.
He added he wanted to see the process stopped and a study set up to see its effects on children in fluoridated and non-fluoridated areas.
It comes after the Cochrane Collaboration, an organisation of 14,000 academics, reviewed fluoridation evidence earlier this year – but they too failed to come to a conclusion.
The researchers found data showed there was some effectiveness in reducing tooth decay but that the only studies deemed admissible were from before 1975 and the risk of bias was high.
Britain is one of few countries in the world that allow fluoridation schemes, where it is aimed to deliver 1mg of the chemical per litre.
In contrast, the US this year reduced the level of fluoride in its water to 0.7mg per litre.
But Public Health England continues to back the scheme and has said it is a ‘safe and effective measure’.
The government body said fluoridation was one of a range of actions it promoted to battle tooth decay, with others including supervised brushing.
According to its research, 45 per cent fewer children aged one to four were admitted to hospital in areas that were fluoridated last year than in those that were not.