❌ Don't Numb Your Teeth. ✅ Fix the Problem at the Root. Instead of fluoride, Boka uses nano-hydroxyapatite (n-Ha), an evolution in dentistry that’s been a gold standard in Japan for over 40-years. n-Ha makes up the primary foundation of teeth and bones, meaning it’s naturally restorative and helpful in reducing sensitivity. Plus, it’s 100% biocompatible and non-toxic. We complement this powerful ingredient with soothing aloe vera, bacteria-fighting xylitol, antioxidant-rich green tea and refresh