# Authority / evidence — `a=japan`

[← All ads](README.md) · [Open the matching landing page](../web/index.html?a=japan)

## Primary text

In the 1980s, Japanese toothpaste makers started building pastes around a particular mineral: hydroxyapatite — the same mineral tooth enamel is roughly 97% made of.

Forty years on, European safety regulators have assessed nano-hydroxyapatite for use in toothpaste and set exact particle specifications for it.

Dr.Strongbite is a small-batch handmade paste built on that mineral — made to that specification — plus calcium, bicarbonate of soda and coconut oil. Ingredients you can pronounce, nothing hiding in a "proprietary blend."

Take the free 60-Second Enamel Check first. One of its results is "you don't need us yet." We mean it.

**Headlines:** Since the 1980s in Japan · The enamel mineral, made simple · Nothing proprietary about it

**Description:** Small batch. Full ingredient list. Honest quiz.

**CTA:** [Learn more](../web/index.html?a=japan)

**Destination:** [`../web/index.html?a=japan`](../web/index.html?a=japan)

**Creative:** Macro photo of blue-green apatite mineral crystal beside the jar. Museum-label typography.

**Notes:** ⚠ GATED. "Made to that specification" may only run once the supplier's particle spec sheet is on file and matches (Build §0.2). Until then, run the ad with that clause deleted. The regulator sentence describes what regulators did — it does not claim approval or endorsement of this product; keep that distinction in every rewrite.