How do i stop gagging when making dental molds ?

Breathe thru nose: Try taking rapid shallow breaths in and out of your nose while the mold is in your mouth. Do not breathe through your mouth or try to swallow.

Nose breathing: You can heave the dentsit spray a topical anesthetic in the mouth then swish around for a minute and spit. That will numb the mouth and can help releive the gag reflux. Also breathe through the nose and stare at one point on a wall.