Abstract In order to illustrate the chemical principles behind the fluoride toothpaste which could prevent dental caries, this paper designed digital experiment by using egg shells instead of teeth.This paper used conductivity sensor to study the dissolution equilibrium of egg shells, and applied gas pressure senor to study whether the egg shells blistered by the fluoride toothpaste had the ability of resisting acid or not. Moreover, this paper used the linear fitting function of Logger Pro to get the reaction rate curve of egg shell and hydrochloric acid, and indicated the limited protection time of fluoride ion. Finally, the cause of the phenomenon was also analyzed theoretically.
WEI Cun-Rong, YE Jing, MA Hong-Jia. Research on Chemical Principle Behind Fluoride Toothpaste by Digital Experiment[J]. Chinese Journal of Chemical Education, 2016, 37(21): 55-58.
