Sir, – Dr Joseph Briscoe (August 1st) objects to Declan Waugh’s argument on fluoridation (July 31st). Mr Waugh has studied the scientific literature thoroughly, as I have done. Associations between harms to humans and fluoridation is quite certain in the cases of four such adverse effects. Evidence for many other adverse effects is less certain but enough to prompt caution and further research, rather than continuing in the face of uncertainty. To respond to these facts with “What nonsense!” is irresponsible.
As for efficacy in prevention of cavities, of course we must respect Dr Briscoe’s personal experience, but it is not consistent with the data from large-scale, systematic studies which show very little or no benefit. The decrease in tooth decay from early 1960s to 2004 occurred equally in fluoridated and not fluoridated industrialised countries. And it is widely accepted now that any benefit is due to a direct effect on tooth enamel, not on swallowing fluoride.
Also many good studies have shown that cessation of fluoridation is followed by reduction in incidence of cavities or no change. – Yours, etc,