Dave, something you may not be aware of, tea leaves are high in fluoride and I know the English love their teas....something to think about and you can do research on that too. I was on a UK run health board for a while and so so many going for replacements so young and I know that "F" does a job on arthritis and fractures...I brought this to their attention, I met a handful of alternative thinking folks but most NOT... Take good care...