Don't be afraid to smile! Braces aren't something that has to be hidden away. If you don't smile at all, even if it's because of something like that, girls tend to get really uncomfortable. Women enjoy having conversations with men who appear happy and confident. A smile is a very important thing. Also, keep eye contact just like you would with a guy. Talking with girls isn't that much different from talking with guys, except that you should probably mind your manners a bit more, such as not cussing as much and staying away from subjects a girl might think are "gross".

Guys and girls are both human, and so much of what separates us is just our way of looking at things. When it comes to communicating, there shouldn't be a huge difference in approach. One thing I can tell you is to talk to more than just one girl constantly, so she doesn't start to think you're interested in being more than friends. Unless you -are- interested in being more than friends, of course. ^_^