Some brands of toothpaste substitute fluoride with xylitol. There is evidence that it hardens enamel. https://www.ncbi.nlm.nih.gov/pubmed/14700079 https://www.

Some brands of toothpaste substitute fluoride with xylitol. There is evidence that it hardens enamel. https://www.ncbi.nlm.nih.gov/pubmed/14700079 https://www.ncbi.nlm.nih.gov/pubmed/14700079 https://www.sciencedirect.com/science/article/pii/S0917239404700099 https://www.sciencedirect.com/science/article/pii/S091723940...