[Solubility and absorption of magnesium fluoride in the intestinal tract].

The solubility rate of various substances was determined via solubility experiments using magnesium fluoride on various specific surfaces. This rate controls the resorption of fluorine ions from MgF2 during its passage through the intestinal tract. The solubility rate for MgF2, as for other hard-to-dissolve substances, is proportional to the specific surface and the mass of the substance. In light of this information, resorption tests with magnesium fluoride showed that this compound is "biodisposable". The amount of fluorine which will be resorbed from MgF2 can be estimated.