Daily, long-term intake of sodium fluoride has been, in multiple research studies, linked to increased risk of cancer, DNA damage, thyroid disruption ... We know it's associated with neurological issues, increased risk of Alzheimer's disease, disruption in melatonin production, and then that whole pineal gland thing—it's an actual calcification of the pineal gland, which is also kind of concerning because the pineal gland is very important when it comes to endocrine function.