title: Fluoride content in table salt distributed in Mexico City, Mexico.
abstract: OBJECTIVE
  The aim of this study was to analyze table salt available in Mexico City's market to identify the fluoride concentrations and to compare these with the Mexican regulations.
  
  
  METHODS
  We analyzed 44 different brands of table salt. All samples were purchased at random in different stores, supermarkets, and groceries from Mexico City's metropolitan area and analyzed in triplicate in three different laboratories (nine determinations per sample) with an Orion 720 A potentiometer and an Orion 9609 BN ion-specific electrode.
  
  
  RESULTS
  Fluoride concentration in the samples varied from 0 ppm to 485 ppm. It was found that fluoride concentration varied widely among the analyzed brands. Also, we found that fluoride concentration in 92 percent of the analyzed samples did not match with that printed on the label. Only 6.8 percent of the analyzed samples contained fluoride concentrations that meet Mexican and WHO regulations.
  
  
  CONCLUSIONS
  The broad variation in the analyzed samples suggests that Mexican Public Health authorities must implement more stringent regulation guidelines and procedures for controlling the distribution of salt and its fluoride concentration for human consumption.
authors.affiliation: Laboratorio de Inmunología, DEPeI, Facultad de Odontología, Universidad Nacional Autónoma de México, Circuito Institutos s/n, Ciudad Universitaria, México D.F.C.P 04510, México. jcarlosh@servidor.unam.mx
authors.forename: Juan Carlos
authors.initials: JC
authors.lastname: Hernández-Guerrero
authors.forename: Javier
authors.initials: J
authors.lastname: de la Fuente-Hernández
authors.forename: Maria Dolores
authors.initials: MD
authors.lastname: Jiménez-Farfán
authors.forename: Constantino
authors.initials: C
authors.lastname: Ledesma-Montes
authors.forename: Enrique
authors.initials: E
authors.lastname: Castañeda-Castaneira
authors.forename: Nelly
authors.initials: N
authors.lastname: Molina-Frechero
authors.forename: Luís Fernando
authors.initials: LF
authors.lastname: Jacinto-Alemán
authors.forename: Lilia Adriana
authors.initials: LA
authors.lastname: Juárez-Lopez
authors.forename: Alejandra
authors.initials: A
authors.lastname: Moreno-Altamirano
mesh_terms: D002327:Cariostatic Agents / Q000032:analysis*; D005459:Fluorides / Q000032:analysis*; D009050:Fluorosis, Dental / Q000517:prevention & control*; D006801:Humans; D008800:Mexico; D012965:Sodium Chloride / Q000737:chemistry*; D017673:Sodium Chloride, Dietary / Q000032:analysis*
chemical_list: D002327:Cariostatic Agents; D017673:Sodium Chloride, Dietary; D012965:Sodium Chloride; D005459:Fluorides