Iodine, in high doses, displaces fluoride. Tamarind also chelates fluoride, and calcium carbonate will take it out of the body just as cilantro chelates mercury and chlorella carries it out of the body.
This is a great post by Wombat, long but thorough:
Besides avoiding fluoride, and displacing it with iodine, we must be sure elimination is really open to get everything out without recirculating and giving us BAD DETOX SYMPTOMS!