caries scores , however , were 42 % lower for the groups receiving the dental powder ( p less than 0.005 ) , 30 % lower for those treated with the combined naf-nas ( p less than 0.005 ) , and 47 % lower for the naf-supplemented drinking water group ( p less than 0.005 ) .
C0011334
caries
C0037508
naf