§ Dr. D. Johnsonasked the Minister of Health how he assesses the required dose of fluoride to be added to water in experimental fluoridisation areas; and to what extent he has followed the recommendation of the Report of the United Kingdom Mission to North America as to the best way of determining the present level of ingestion of fluoride in human beings.
§ Mr. TurtonThe right level for the fluoridation of water in the studies in this country was determined as a result of investigations into the effects of water which naturally contain fluoride, and in the light of over ten years of experience in other countries. It has been found that at one part per million a very high degree of protection against caries is given, but the mottling caused by higher concentrations is avoided. As regards the Mission's suggestion for a survey of fluoride excretion a pilot investigation confirmed the results obtained in other countries.