Recently there was a post asking about any evidence for the ill effects of Fluoride on Thyroid. If you put onto Google the words
Fluoride Thyroid UK
They have a very interesting 2 page article. This refers to an 8 page article. In the Thyroid Uk article it gives the information on the relative amounts of fluoride in the different types of Tea. eg Green tea has more than black tea.
You don't need to go by Google and tell them everything you want to view! 
The fluoride you find in tea is not the same as the fluoride they put in toothpaste and water. The former is natural, the latter is industrial waste!
You can get fluoride free toothpaste
A friend was a botanist and when working in this field his team tested fluoride as a weed killer.
Doesn't mean much on its own - after all, ordinary salt, sodium chloride, can be used as a weed killer.
The first link I found which discusses using salt:
weedicide.co.uk/salt-kill-w...
I appreciate this as I use salt to kill weeds, however, salt isn’t added to our drinking water. (Actually I don’t think that ours is fluoridated, thank goodness.). It was a bit of a throw-away remark on my part.
Underactive thyroid 30% more likely in areas of highest fluoridation.
Addition of fluoride in water supplu
Strong fluoride toothpaste 
Fluoride and thyroid
