Just a clarification that tea (black or green) doesn't naturally contain fluoride but gets it from the soil and water. So maybe it would be safer if it was grown on the soil that doesn't have fluoride?
_http://toxipedia.org/display/toxipedia/Fluoride+Content+in+Tea
Camellia sinensis, the tea plant, produces what can be called "true teas" such as green, black, and oolong (Parkinson). Accumulation of Fluoride in the tea plant comes from its natural ability to absorb Fluoride from surrounding soil. It is estimated that up to 98% of the Fluoride content in the tea plant is deposited in its leaves, particularly the old ones, following the release of Fluoride from [aluminum] Fluoride complexes initially formed at the roots (Lu, et al., 2004). Fluoride has been suggested as an efficient, cost-effective indicator of maturity as well as a negative indicator of quality. Reason for the latter is due to the increase of Fluoride content paralleling a decline in beneficial polyphenols as the tea plant ages (Lu, et al., 2004). The most notable catechin polyphenol found in Camellia sinensis is epigallocatechin gallate (EGCG), a strong [anti-oxidant] that reduces LDL and acts as an anti-Cancer agent (Parkinson).
Added: There is also
this:
Due to modern day environmental pollution fluoride and aluminum have also been found to occur in tea, with certain types of brick tea made from old leaves and stems having the highest levels. This occurs due to the tea plant's high sensitivity to and absorption of environmental pollutants.
So the solution appears to be, to either find a place where one can buy tea grown on soil without pollutants or soil fertilizes, or to plant a tea tree. :) Then one can enjoy all tea's benefits without the added poison.
Here is also
a study that made a comparison of the fluoride content of four tea brands (Lipton, Ceylon, Golestan and Mozafar). They concluded that there was a significant difference between the fluoride concentration of these four tea brands, and Lipton appeared to have the highest floride concentration.
If so, maybe it would be safer to go with smaller companies and brands than big corporations as Lipton that probably pollute the soil like hell. It also explains why in the past tea was so well known and used for its health benefits. Then they still had clean soil.