You've just finished talking to the cutest guy in your class when your best friend informs you that your breath stinks!
What to do: If your mouth often smells funky, you might not be brushing and flossing well enough. Or it could be the onions or garlic at lunch. Brush twice a day, including your tongue. Try mints or sugarless gum. Test by licking the back of your hand and taking a whiff after it dries. If nothing helps, see your doctor or dentist.