On: Trials begin on lozenge that rebuilds tooth enamel

[Etheryte]

The results for hydroxyapatite seem to be mixed, some studies have found it has no statistically significant benefit over fluoride toothpaste [0], while others have found some benefit [1][2]. Interesting none the less, thanks for linking to it.

[0] https://www.nature.com/articles/s41405-019-0026-8

[1] https://pubmed.ncbi.nlm.nih.gov/25019114/

[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5121804/