[Total and soluble fluoride concentration in children´s toothpastes in Spain.]

The use of fluoridated toothpastes is considered the most rational method in dental caries control, and it is recommended for all ages people, but for this they must be established at a minimum concentration of 1,000 ppm of total soluble fluoride, in pediatric patients. The objective of the study was to determine the concentration of total and soluble fluoride present in toothpastes marketed in Spain for pediatric use.

A descriptive and cross-sectional study was carried out throughout 2019, analyzing 11 toothpastes for pediatric use marketed in Murcia, Spain. The concentration of fluoride (ppm F=mg F/Kg) total (FT), soluble (FTS) and fluoride ion (F) and MFP (FPO₃²-) was analyzed using an ion-specific electrode coupled to an ion analyzer. A descriptive study was carried out to determinate mean and standard deviations for each variable analyzed.

Among the analyzed toothpastes, 45% contained NaF (sodium fluoride), 45% MFP (sodium monofluorophosphate) and 10% both types of salts. The abrasive used was silica. 98% of the analyzed toothpastes showed total fluoride contents similar to those described by the manufacturer, only 3 toothpastes had fluoride concentrations lower than those described. The range obtained from FT oscillated between 398 -1,474.6 ppm F, and 100% of the toothpastes did not show differences between values of total fluoride and soluble fluoride.

Most of the analyzed toothpastes contain a concentration of soluble fluoride between 1,000-1,500 ppm Fluoride, corresponding to the values described by the manufacturers However, there are still toothpastes with values lower than those recommended, minimum 1,000 ppm F, that do not allow effective anticaries activity from a public health point of view.