Note the study fed high amounts of it.
Brushing your teeth with it, which you dont then go and swallow it, is not being fed high amounts of it. Plus factor in we are 100-200 times the weight of rats.
Tnis stuff is in general, safe and great for tooth repair and reversing micro cracks in enamel, incorporating into the teeth and becoming teeth. It strengthens your teeth.
You dont eat it in large amounts.
The very common rod shaped form is safe.
In the General/Chat forum, on a thread titled Is Hydroxyapatite Safe? The Muddy Waters of Nano and Microparticles, Secret Agent Man wrote: Note the study fed high amounts of it.
Brushing your teeth with it, which you dont then go and swallow it, is not being fed high amounts of it. Plus factor in we are 100-200 times the weight of rats.
Tnis stuff is in general, safe and great for tooth repair and reversing micro cracks in enamel, incorporating into the teeth and becoming teeth. It strengthens your teeth.
You dont eat it in large amounts.
The lifestyle choice of using Hydroxyapatite means exposure 2 or 3 times per day indefinitely and overtime, the impact would be cumulative.
The hydoxyapatite ends up places unexpected - the rats were injected or fed the subtance but it was found in the lungs.
For humans brushing their teeth, causing micro abrasions in the gums, exposing mouth surfaces abraded by foods and gums by flossing, unintentionally swallowing portions of it would contribute to a cumulative 'dose'. Hydroxyapatite initially sticks in pores of the teeth upon brushing, but surely residue breaks free and is ingested - all these things contribute to cumulative ingestion. For this reason, toxic substances are not permitted in toothpaste - not that the public eats toothpaste, but it's not perfectly controllable.
The point of over-feeding rats is to exaggerate in a matter of days or months a 'worse case scenario' from which to estimate the impacts of smaller accumulation in humans which may occur over time, even years, when brushing teeth daily with this stuff.
Note the article says hydroxyapatite was found in significant amounts in baby formula *shudder*.