The EU has said nano-hydroxyapatite is safe if it is rod shaped, which is what many of these toothpastes use.
One I use is Davids Hydroxi Fluoride Free Nano Hydroxyapatite Toothpaste for Remineralizing Enamel.
The EU information approving this is here:
https://health.ec.europa.eu/publications/hydroxyapatite-nano-0_en
In the General/Chat forum, on a thread titled Is Hydroxyapatite Safe? The Muddy Waters of Nano and Microparticles, ConservativeMind wrote: The EU has said nano-hydroxyapatite is safe if it is rod shaped, which is what many of these toothpastes use.
One I use is Davids Hydroxi Fluoride Free Nano Hydroxyapatite Toothpaste for Remineralizing Enamel.
The EU information approving this is here:
https://health.ec.europa.eu/publications/hydroxyapatite-nano-0_en
Yes, but I'm pretty sure the EU says Covid 19 'vaccines' are safe. I personally am going to wait until they examine the impacts of hydroxyapatite nano particles on the blood brain barrier. I no longer have much trust in 'new' products inadequately tested.
Manufacturers are not precise about the percentages of different shapes, and sizes. The article notes that larger sizes wouldn't be effective on tooth enamel, and yet the article below says smaller rod shapes contribute to inflammatory response during testing.
Effects of four types of hydroxyapatite nanoparticles with different nanocrystal morphologies and sizes on apoptosis in rat osteoblasts
Affiliations
- PMID: 22162110
- DOI: 10.1002/jat.1745
"Here, we aimed to compare the effects of four types of nano-HAP with different nanocrystal morphologies (short rod-like, long rod-like, spherical or needle-shaped crystals) and sizes (10-20, 10-30 or 20-40 nm) on growth inhibition and apoptosis in primary cultured rat osteoblasts. The osteoblasts was treated with the four types of nano-HAP at various concentrations (20, 40, 60, 80 or 100 mg l⁻¹). The nano-HAP specific surface area was detected using the Brunauer, Emmet and Teller method. The cell growth rate was detected using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay; apoptotic alterations and the level of reactive oxygen species in osteoblasts were measured using flow cytometry; and the amounts of apoptotic p53 and cytochrome c proteins were measured using western blotting. We observed that all four types of nano-HAP inhibited the growth of osteoblasts in a dose-dependent manner. These nano-HAP significantly induced apoptosis in osteoblasts. Nano-HAP with smaller specific surface areas induced lower apoptosis rates. The needle-shaped and the short rod-like particles induced greater cellular injury than the spherical and long rod-like particles, respectively"