The Fluoride Stare is an internet slang term used to describe a vacant, wide-eyed, or 'soul-dead' facial expression. The term originates from conspiracy theories suggesting that fluoride added to drinking water leads to cognitive decline or a lack of spirit, often referred to as being 'calcified.' While the theory itself is often discussed ironically, the meme became a staple of 'schizoposting' subcultures on platforms like TikTok and X (Twitter). It is typically used to mock people who appear oblivious to their surroundings or to represent the feeling of being completely checked out from reality. The visual usually highlights glazed-over eyes and a lack of emotional response, becoming a popular way to react to unsettling or absurd online content.