This document provides information about oral health and proper dental care. It discusses why teeth are important for eating, talking and smiling. It explains that humans have two sets of teeth in their lifetime - 20 milk teeth and 32 permanent teeth. The structure of a tooth includes the crown and root. Common oral health problems include tooth decay, gum disease, and malocclusion. Tooth decay occurs when bacteria in plaque produces acid that destroys tooth enamel. Preventing oral health issues requires regular brushing, flossing, healthy eating, and dental checkups.