Your teeth will be...... sensitive for a while. I dealt with it by using my molars as incisors, slowly tearing apart anything semi-solid. It will be impossible to eat anything you couldn't smush with your pinky.

When your braces hook under your upper lip, you can do two things. Stop smiling immediately by developing a taste for gothic literature, or gain a bad habit of snarling, which is the expression one makes when you push your upper lip farther forward than it should.