Your teeth are important for smiling, chewing, and speaking. Children have 20 teeth that fall out and are replaced by 32 adult teeth. Teeth have different parts like roots under the gums and crowns on top. Plaque buildup from sugar causes cavities, so brushing teeth with toothpaste before bed and flossing daily helps remove food and plaque to keep teeth healthy. It's also important to see the dentist twice a year for checkups and cavity treatment.