Abstract
In Brazil, most toothpastes are formulated containing calcium carbonate (CaCO3) as an abrasive and sodium monofluorophosphate (Na2FPO3; MFP) as an active ingredient against cavities. This formulation has a low cost and is often acquired through tenders by the Unified Health System (SUS) and distributed to the population. However, over time, the MFP ion undergoes hydrolysis, and the fluori…