A dietary form of fluoride supplementation. It has been available in some countries, e.g. Switzerland, since 1955 and is considered cheap and effective for rural communities in developing countries. It is produced by mixing measured amounts of sodium fluoride and salt together; it can also be manufactured by spraying a solution of potassium fluoride onto the refined salt. It is less effective than some other methods as a preventive measure, since salt consumption is lowest in young children. It can result in a very variable intake and may be excessive in areas with water fluoridation.
Marthaler T. M., Petersen P. E. Salt fluoridation – an alternative in automatic prevention of dental caries. Int Dent J 2005;55(6):351–8.