“Dental public health administrators should be aware of the total fluoride exposure in the population before introducing any additional fluoride programme for caries prevention.” – World Health Organization. Fluorides and Oral Health. WHO Technical Report Series 846, 1994.

“In the assessment of the safety of a water supply with respect to the fluoride concentration, the total daily intake by the individual must be considered.” – World Health Organisation. International Drinking Water Standards, 3rd Ed., 1971.