The second alternative is the development of dentifrices
with low fluoride concentration, which are already
available in many countries. Some studies did not found
significant differences in the anticaries effectiveness
between the fluoride toothpastes with low (500-550 ppm)
and standard concentration of fluoride (1.000-1.1000
ppm) (17,18). Nevertheless, some other researches are still
controversial when considering the effectiveness of low
fluoride toothpastes (19, 20).