Alexia is right about gum, but just to warn you, chewing gum is a habit replacer. That's where you take a habit and replace it with another. For some people chewing gum is a good idea, but just make sure it's sugar free, or else you might get in trouble with the dentist, or otherwise, just suck on some ice cubes, but beware that you don't bit them too much, that could do some damage to your teeth!