TONY KELLY (HAS, July 20) rather misses the point in his letter about fluoride.

Mr Kelly describes fluoride as "an essential component of our diet, but it is a perfectly harmless and quite helpful one".

M Watson's original letter (HAS, July 8) criticised the decision to add fluoride to water supplies giving people no choice on whether or not to use it "perfectly harmless", or not.

I can eat peanuts with no effect, but others could die with the slightest taste.

The same applies to fluoride, but the difference is I have the choice of eating peanuts or not.

Put fluoride in the water and I have no choice.

I have read of people who have to travel miles to drink fluoride-free water or else they will suffer severe reactions.

Tom Cooper, Durham.