Buy 3% hydrogen peroxide at a drug store. When you feel that a flu or a cold is coming, you can cure it before it sinks through all the way. All you need to do is put one to two drops of hydrogen peroxide into your ear. Wait for a minute for it to fizz then move onto the other ear. The infection will be gone when you use this trick. Hydrogen peroxide can also be used as a mouth wash if you have really bad breath. Try mixing it with water and use it as a mouth wash and it'll help your breath as well as whiten your teeth.