What is nano-hydroxyapatite? Can it reverse tooth decay? Admin, December 18, 2025 https://www.youtube.com/watch?v=WSM49WTo4D4&showinfo=0&rel=0Dr. Paul O’Malley shows and explains what the difference is between hydroxyapatite and nano-hydroxyapatite and why we have 6.5% of the nano form in our toothpaste and how this mineralizes ones teeth! Healthy Gums Healthy Teeth Oral health Teeth Whitening