If you’ve seen a viral post warning that “teething opens the blood-brain barrier” and “vaccines flood the brain with neurotoxins”—take a deep breath. That claim? 🚨 It’s not just misleading—it’s dangerously wrong. Yes, teething triggers some local histamine release (like a bug bite). No, it doesn’t “open the brain” to toxins. 🧠 The blood-brain barrier is not a swinging gate that flips open because your baby is drooling. And the studies being used to support this theory? They have nothing to do