Xylitol is known to help reduce cavity-causing bacteria. Additionally, researchers have found that xylitol products support fluoride’s remineralization and strengthening efforts. In one study, they even found that xylitol helps fluoride penetrate deeper into the enamel. They found that a combination of trimetaphosphate, xylitol, and erythritol affected the uptake of fluoride so much that it strengthened enamel 33% more than fluoride alone.
Marcato, R. A., Garbelini, C. C. D., Danelon, M., Pessan, J. P., Emerenciano, N. G., Ishikawa, A. de S., Cannon, M. L., & Delbem, A. C. B. (2021). In situ evaluation of 200 ppm fluoride toothpaste content trimetaphosphate, xylitol and erythritol on enamel demineralization and dental biofilm. Journal of Dentistry, 111, 103724.