What can I do before I go to the dentist to have a less of a gag reflex?

[Christopher L]

I know there are a lot of people out there like this, when they put something in there mouth and they start or feel like throwing up. I've been to the dentist several times, and all those times, when ever he sticks something to touch my tongue, i almost throw up. When he sticks something in the back of my throat, i fell like throwing up. It sucks. I know saying AHHHHHHHH helps a bit, but i can only do it for so long.

Is there any good ideas, or remedies that I could or should do to stop this?