The human upper molar, located in the back of the mouth, plays a crucial role in grinding food. It has a large, flat surface with multiple cusps, making it ideal for crushing and grinding. Adult humans typically have three upper molars on each side, known as the first, second, and third molars. The first appears around age six, the second around age 12, and the third, or wisdom tooth, may emerge in late adolescence or early adulthood, but is often extracted due to lack of space or misalignment. Proper care is essential to prevent tooth decay.