I don't know why, but lately ALL my teeth seem to be taking on a black-gray stain. I also looked into doxycycline being fed to my TJ's bacon, but I didn't immediately find any connectons. I just moved into a new home with a well. It has a trace of lead in the water, like .005 if I recall, but it might have been .0005. Maybe my kombucha is freeing up the metals in my water and they are binding to my teeth when I drink the bucha. Anybody have any ideas or other possible contributors? It really seems to be related to the kombucha, because I often notice it right after I drink the stuff, and it mostly rubs off but some seems to be staying. Didn't happen before I moved here.

I guess I could brew my kombucha with water from the artesian spring nearby for awhile and see if that fixes it...