Nanohydroxyapatite is an ingredient already contained in high quality toothpastes such as Apagard. As we age the enamel on our teeth wears down and the dentin is exposed. This exposed dentin makes teeth both vulnerable to cavities and also other problems such as tooth pain from cold drinks. Anyone who has had these problems may have gone to their dentist and been given a 1.1% fluoride prescription toothpaste or something similar but the problem with these solutions is they are only temporary and don't last very long if you stop using the medicine.
The new study has shown that nanohydroxyapatite can be encapsulated with EGCG and that this new combination has a sort of synergy which allows for acid resistance:
The researchers encapsulated nanohydroxyapatite and a green tea polyphenol -- epigallocatechin-3-gallate, or EGCG -- in silica nanoparticles, which can stand up to acid and wear and tear.
This is very interesting and because this is a cheap and practical solution, if it does work then it can be in toothpastes very soon. It might be a good idea to buy this toothpaste when it's available if you already use something like Apagard or have sensitive teeth.
References
American Chemical Society. (2017, August 2). An end to cavities for people with sensitive teeth?. ScienceDaily. Retrieved October 1, 2017 from www.sciencedaily.com/releases/2017/08/170802102807.htm