First of all, look at whether the packaging is intact; Secondly, see if the label on the packaging bag is printed with product name, net content, ingredient list, factory name, address, production date, standard number and dealer. At present, the edible salt in Shanghai is purchased, repackaged and distributed by Zhongyan Shanghai Salt Company. Fluorine is mainly absorbed in the stomach, mainly distributed in bone marrow and teeth, which can prevent dental caries and senile osteoporosis. Low fluoride not only affects teeth, but also affects bones. However, excessive intake of fluoride will lead to fluorosis and "dental plaque", and long-term excessive intake of fluoride will also cause damage to bones and kidneys. Each person's daily intake of 2.3 ~ 3. 1 mg of fluoride can fully meet the needs of the human body for one day. Fluoride intake from daily diet and drinking water can completely meet this demand. According to the national standard, the fluorine content in fluoride salt should be controlled at100 30 mg/kg, and the fluorine content should be clearly marked on the packaging bag; The fluorine content of common edible salt must be controlled below 5.0mg/kg. Nutritional fortified salt generally refers to the edible salt in which nutritional fortifier is added to common edible salt. For example, calcium fortified salt is to add calcium lactate, active calcium, calcium phosphate, biological calcium and other raw materials to ordinary edible salt. Because the acidity and solubility of various fortifiers are different, adding them to edible salt will have a great influence on the acidity and solubility of edible salt. The pH value of common edible salt is generally in the range of 5~6, which is weakly acidic and easily soluble in water. However, due to the addition of nutritional fortifiers, the pH value of some nutritional fortified salts will rise to 12, which is strongly alkaline and extremely difficult to dissolve in water. Too much alkaline salt will do some harm to the stomach. Insoluble in water, it is difficult for human body to absorb sodium ions and chloride ions in edible salt.

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