I've been doing xylitol 2-3 times a day and so far teeth feel nice, I'll have to wait more though as baking soda seemed like it helped at first but then teeth became sensitive again. I'm not sure how xylitol affects the ph of the saliva so perhaps something else is needed for optimal teeth. It may sound obvious but I'm wondering why no one rinses his mouth with calcium carbonate and some K2. A kale broth could work as well given it has both calcium and vitamin K.