a new index for measuring the prevalence of dental fluorosis , the tooth surface index of fluorosis ( tsif ) , was used to assess the condition in the permanent teeth of 807 children , aged 8 to 16 , who had resided all their lives in one of seven illinois communities with an optimal concentration of fluoride in its water or with 2 , 3 , or 4 times the optimal concentration .
C0026618
dental fluorosis
C0040435
the condition