What is the most common cause of the gag reflex in a complete denture patient?

The most common cause of gagging in complete denture patients is overextension of the posterior border of the maxillary denture, which contacts the soft palate and uvula (highly gag-sensitive areas). Other causes include: psychological (anxiety-related), a thick posterior palatal region, and extension onto the posterior tongue. Management strategies include shortening the posterior border, applying topical anesthetic to the soft palate, desensitization techniques, and in severe cases, acupressure at the P6 point or referral for hypnotherapy. Inadequate palatal seal (option a) causes denture instability but is not the primary gag trigger.