Yes, toothpaste can clean headlights. The abrasive nature of toothpaste can help to remove the build-up of grime and dirt that can dull the appearance of your headlights. For best results, use a white toothpaste on a soft cloth and rub in a circular motion. Rinse with water and dry with a soft cloth. You should see a noticeable difference in the clarity of your headlights.