Objective To study the effects of drinking water defluorinated by active magnesium oxide (denflorinated water by magnesium salt) on the cerebral functions of mice and to approach the appropriate residual concentration of Mg in the defluorinated water. Method A behavior - toxicological test (shuttle Box Test) was carried out on the mice of control and three defluorinated water groups in which the residual concentration of Mg were 350, 175 and 85mg/L respectively. The cholinesterase(ChE) activity and Mg con...