Pineal gland info that I thought was enlightening:
https://www.youtube.com/watch?v=WY1tTgfxq9c
This dude explains a lot of interesting things about pineal glands, fluoride in the water destroys the pineal gland and makes us apathetic according to him.
https://fluoridealert.org/issues/health/pineal-gland/
Seems to be several references outside of his opinion that back it up. This link cites several seemingly legitimate sources.
Plus there is a guardian article that refutes it so that is practically an endorsement as well
https://www.theguardian.com/commentisfree/2013/sep/19/anti-fluoride-science-australia
Here are their citations:
Farkas G, et al. (1983). The fluoride content of drinking water and menarcheal age. Acta Univ Szeged Acta Biol. 29(1-4):159-168.
Kunz D, et al. (1999). A new concept for melatonin deficit: on pineal calcification and melatonin excretion. Neuropsychopharmacology 21(6):765-72.
Luke J. (2001). Fluoride deposition in the aged human pineal gland. Caries Res. 35(2):125-128.
Luke J. (1997). The Effect of Fluoride on the Physiology of the Pineal Gland. Ph.D. Thesis. University of Surrey, Guildford.
Mahlberg R, et al. (2009). Degree of pineal calcification (DOC) is associated with polysomnographic sleep measures in primary insomnia patients. Sleep Med. 10(4):439-45.
National Research Council. (2006). Fluoride in Drinking Water: A Scientific Review of EPA’s Standards. National Academies Press, Washington D.C.
Schlesinger ER, et al. (1956). Newburgh-Kingston caries fluorine study. XIII. Pediatric findings after ten years. J Am Dent Assoc. 52(3):296-306.