I agree that teeth and bones are closely related in how they work/grow/function/etc. Good oral hygiene is also important, but in our household, we (sadly) have fluorinated water. We are working to get rid of that. I have no idea about which toothpastes normal people use, but ours is natural, xylitol since I can't find my natural, Nicco one (indian/ayurvedic, probably the best out there!). We also use coconut oil.
Fluoride, it's a pickle.