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How to suppress the gag reflex
Numb your soft palate.
When an object touches the soft palate, it can trigger the gag reflex. Use an over-the-counter (otc) throat-numbing spray like chloraseptic to desensitize your soft palate.
Alternatively, you could gently apply a topical otc analgesic with benzocaine using a cotton swab. The effects should last for about an hour, and your palate will be less reactive.