I have found good, caring dentists are hard to come by but they're out there. I think you've been given some great advice!
Plus, put some weight on your bones to strengthen them. Lifting weights is a great way to exercise. I have osteoporosis, I'm 72 and am taking nothing except collagen powder. I ride my bike, walk and lift weights regularly. I'm praying I'm holding my own with bone density. Best of luck to you!