The trigeminal nerve plays a central role in migraine development. It is the primary sensory nerve of the face, jaw, and head, and it transmits pain signals from these regions to the brain. In patients with chronic migraine, the trigeminal nerve becomes hyperexcitable, meaning it fires pain signals more easily and more frequently than normal.
Repeated migraine attacks cause the trigeminal nerve to release excessive amounts of pain-signaling neurotransmitters, including CGRP, substance P, and glutamate. This ongoing chemical signaling keeps the nervous system in a constant state of alert, lowering the threshold for future migraines and contributing to chronic headache patterns.
Botox helps calm the trigeminal nerve by inhibiting the release of these neurotransmitters at peripheral nerve endings. By blocking their release locally, Botox reduces trigeminal nerve activation before pain signals reach the brain. This preventive action decreases the likelihood that common triggers will escalate into full migraine attacks.
Over time, reduced trigeminal nerve activity leads to less continuous pain input into the central nervous system. This allows the brain and brainstem to become less reactive, reducing central pain amplification and increasing migraine thresholds.
This mechanism explains why Botox is effective as a preventive treatment rather than a rescue therapy. Instead of treating pain after it begins, Botox addresses migraine pain at its neurological source. For patients with chronic migraines driven by trigeminal nerve hypersensitivity, Botox offers an evidencebased approach that targets the underlying cause of repeated attacks.
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