On an episode of Mythbusters they tested several uses of vodka, one was whether a vodka+cinnamon mouthwath worked. Here's a quote:
"Can you mix cinnamon and vodka together to make an effective mouthwash? Well, when Kari makes the mixture, it looks more like a bottle of mud. Two weeks later she filters the mixture through a coffee filter. Adam is used once again for a stink test, after smoking a cigarette, eating garlic and some stinky cheese. Against commercial mouth wash, the cinnamon mouthwash holds its own very well. Myth confirmed, once again."
Plus, you can probably drink it afterwards.