<prompt> The caries reduction benefits of water fluoridation to primary teeth and permanent teeth respectively -10-30, 30-5040-50, 50-60,10-20, 20-4050-70, 60-80  <response>: Murray reviewed 113 studies conducted in 23 countries to help clarify various reports on the benefits to primary teeth of communal water fluoridation.72 A thorough review of the data clearly showed that water fluoridation provides protection for primary teeth against dental caries but to a somewhat lesser degree for permanent teeth. The caries reduction benefits to primary teeth ranged between 40 and 50, whereas the range for permanent teeth was between 50 and 60. 