The objective of this study was to assess the ability of a dentifrice containing 8 % arginine and calcium carbonate ( Pro-Argin ' Technology ) , and 1450 ppm fluoride as sodium monofluorophosphate ( MFP ) to prevent enamel loss from an erosive acid challenge in comparison to a silica-based dentifrice with 1450 ppm fluoride as MFP using an intra-oral erosion model .