Japan uses hydroxyapatite toothpaste as standard

Grok:

The claim that "Japan uses hydroxyapatite toothpaste as standard" is a bit of an oversimplification, but it has a solid basis in reality—Japan has been a global pioneer in nano-hydroxyapatite (n-HA or medical hydroxyapatite, often abbreviated mHAP)-based toothpastes for over 40 years, and these products are very popular and widely available there, especially in premium and remineralizing segments. Japan does not use hydroxyapatite toothpastes as the single nationwide "standard" replacement for all fluoride ones (fluoride toothpastes are still sold and used), but hydroxyapatite-based options are a mainstream, government-recognized alternative with strong market presence and official approval for anti-cavity effects.

Source: Grok, in relation to this X post -> https://x.com/yoursimmo11/status/2033252892715655173?s=20