enamel fluoride levels at the end of 2 years were 3,124 parts/10 ( 6 ) ( ammonium fluoride ) , 2,771 parts/10 ( 6 ) ( sodium fluoride ) , and 2,603 parts/10 ( 6 ) ( placebo ) , p = 0.025 .
C0016327
fluoride
C0037508
sodium fluoride