In a study looking into the impact of mothers using xylitol, researchers found, “habitual xylitol consumption by mothers was associated with a statistically significant reduction of the probability of mother-child transmission of MS [the cavity-causing bacteria in the mouth] assessed at two years of age. The effect was superior to that obtained with either chlorhexidine or fluoride varnish treatments performed as single applications at six-month intervals.”
Söderling, E., Isokangas, P., Pienihäkkinen, K., & Tenovuo, J. (2000). Influence of maternal xylitol consumption on acquisition of mutans streptococci by infants. Journal of Dental Research, 79(3), 882–887.