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Excerpt from Fluoridation Census, 1985 Adjusted uoridation is the conscious maintenance of the optimal fluoride concentration in the water supply for preventing dental caries. The optimal concentration may be accomplished by adding fluoride chemicals to fluoride deficient water; by blending two or more sources of water naturally contain ing fluoride to achieve the optimal concentration; or by partial defluoridation, that is, removing naturally occurring excessive fluorides to obtain the recommended level. Water systems are considered to have dentally significant natural fluoridation if they contain parts per million (ppm) or more of naturally oc curring fluoride. Water systems and communities with optimally adjusted fluoride and naturally occurring uoride in water are listed in this publication. Adjusted water systems are uoridated at the optimal level according to the average maximum daily air temperature in the community. (recommended concentra tions, according to National Interim Primary Drinking Water Regulations, 1975, are shown on Table A.) About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.