Tooth size refers to the dimensions of teeth, which can vary significantly among different species and individuals. Factors influencing tooth size include genetics, diet, and age. In humans, for example, the size of teeth can differ between primary (baby) teeth and permanent teeth, as well as among different individuals. In the animal kingdom, tooth size is often adapted to specific dietary needs. Herbivores typically have larger, flatter teeth for grinding plant material, while carnivores possess sharper, more pointed teeth for tearing flesh. Understanding tooth size helps researchers study evolutionary adaptations and dietary habits in various species, including humans and wild animals.