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Re:Prenatal Fluoride Exposure and Cognitive Outcomes in Chil... by bobthechef on Saturday May 26, 2018 @11:04AM (#17162415)
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.sciencedirect.com/science/article/pii/S091723940...

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