An intra-oral remineralization study was conducted to compare the ability of a dentifrice containing 8 % arginine and calcium carbonate ( Pro-Argin Technology ) , and 1450 ppm fluoride as sodium monofluorophosphate ( MFP ) to remineralize acid-softened bovine enamel specimens compared to a silica-based dentifrice with 1450 ppm fluoride as MFP .