이 (Tooth) is a hard, calcified structure found in the mouths of many animals, including humans. It plays a crucial role in the process of eating by helping to break down food into smaller pieces. Teeth are composed of different layers, including enamel, dentin, and pulp, each serving a specific function in maintaining dental health. In humans, there are four main types of teeth: incisors, canines, premolars, and molars. Each type has a unique shape and purpose, such as cutting, tearing, or grinding food. Proper dental care, including regular brushing and visits to the dentist, is essential for maintaining healthy teeth and preventing issues like cavities and gum disease.