Hydroxyapatite is another name for Calcium Phosphate. Calcium Phosphate is the building blocks of your enamel and bone. This naturally occurring mineral creates hard and strong teeth and bones.
NASA in the 1970s created a synthetic version of Hydroxyapatite with Nano sized particles to address astronaut's enamel and bone loss occurring in while in zero gravity.
Later that decade a Japanese company created an enamel restoring Nano Hydroxyapatite toothpaste.
When your saliva is acidic it erodes your enamel and bone. Neutral to slightly alkaline saliva allows Nano-Hydroxyapatite to remineralize enamel and bone. It remineralizes evenly by filling in the pores of enamel and bone.
Nano-Hydroxyapatite is safe to swallow unlike fluoride toothpaste. Chewtab NHAP toothpaste tablet formula is natural and made in the USA.