What chemical used to prevent tooth decay?

The most important component of toothpaste is fluoride, which will strengthen the tooth enamel. Some types of toothpaste contain xylitol as well, which acts as an antibacterial to fight caries. Toothpaste also contain abrasive material to help remove deposits of food and plaque and different types of flavor ingredients, e.g. menthol, to remove or mask bad breath.