Calcium Hydroxyapatite actually makes up approximately 95% of your enamel and 70% of your dentin, the HAp in our tabs is derived from phosphate rocks making it Vegan. It is designed to be highly effective in combating caries, reducing sensitivity and remineralizing your teeth. Fun Fact: HAp was created by NASA to help regenerate the teeth and bones of astronauts returning from zero-gravity missions.Click here to learn more.