BioMin F is a low-fluoride toothpaste, whilst BioMin C is a fluoride-free formulation. BioMin F contains Fluoride in the glass besides Calcium and Phosphate, but in the case of BioMin C, a Chloride ion replaces the Fluoride ion incorporated in the bioglass structure. BioMin C is a more reactive glass and develops apatite formation more rapidly, precipitating Hydroxyapatite onto the tooth surfaces rather than Fluorapatite, as it does with BioMin F.