FYI, most salt in Mexico contains fluoride. Worse, it's not required to be listed on the label (sometimes it is). When you see "sal yodada" (iodized) there is a good chance it also contains fluoride. I discovered that after coming here and have since completely stopped buying prepared foods or eating in restaurants. It's been good for my waist line at least.

In case you're not aware, sodium fluoride has been used as pesticide for over 100 years. It causes all kinds of health problems and has no nutritional value.
any benefit to teeth is questionable, even for children.