The study referred to by Earl Howe is open to criticism.
The
authors themselves note: "it
is accepted that a cross sectional study is not the most robust design for
assessing the impact of water fluoridation. However, the cost implications for a
study design that would include prospective monitoring of birth cohorts, serial
cross sectional surveys that include analysis of diet and total fluoride intake
with anthropometric measurements would be cost prohibitive and beyond the scope
of this project. Nevertheless, the aforementioned are important considerations
to be taken during study design."
They
also note that children in Manchester were more likely to not rinse after
brushing their teeth and therefore more likely to swallow their toothpaste -
hence the higher fluorosis levels. Full paper available at:
Stephen
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