Nighttime driving can be dangerous as a result of factors like insufficient street lighting and poor night vision. When you take all those hazards into consideration, you know that the last thing you need are foggy headlights. If you're having trouble seeing the street, you can turn to an unlikely ally: toothpaste. Just keep a small tube in your glove compartment. If you notice that your lights could be brighter, dab some toothpaste on a cloth, and rub it in to erase dirty buildup.