SIR - Regarding fluoridation of water supplies, it will be a waste of time and money to once again assess public opinion without first of all broadcasting information on this subject.

Unless this is done, there will again be a vociferous rejection of mass medication.' It will be 30 or 40 years ago since it was first recognised that the incidence of decaying teeth of children in Derbyshire was significantly less than elsewhere; it was already known that the fluoride content of water in this district was higher and it is only common sense to regard other areas as deficient.

Correcting this deficiency has now been proven to be beneficial and the utmost public health sense, not mass medication.

A Rushton, retired GP, Keighley Road, Denholme