Potassium Nitrate + Sodium Monofluorophosphate + Triclosan is a combination of three medicines and is used to prevent Dental cavities and reduce sensitivity for for hot and cold . Potassium Nitrate specially works by calming the nerves in the teeth to reduce sensitivity . . Triclosan kills the harmful bacteria and fungi by attacking their outer covering. Sodium Monofluorophosphate works by making the teeth stronger and preventing decay / cavity caused by bacteria.