Toothpaste and toothpowder are substances used with a toothbrush to clean teeth. Both contain a mildly abrasive substance, such as finely powdered chalk (calcium carbonate), and a detergent (soaplike material). Some sweetening agent other than sugar, and flavoring oils, are included to make the agent taste good. Glycerol or a similar material is added to these basic ingredients to make toothpaste. Many toothpastes contain fluoride, a chemical that helps prevent decay.
