Guys: What to do when a guy sticks his tongue in my mouth?

I just started dating my first boyfriend and we had our first kiss and then things got heated and he asked if we could make out so I said sure and he put his tongue in my mouth and then moved it around in like a darting motion and I pulled away because I was uncomfortable with it. Also there was a lot of saliva. What should I do when he puts his tongue in my mouth and how do I politely tell him that he gives dog kisses?
Guys: What to do when a guy sticks his tongue in my mouth?
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