Gear teeth are the small, pointed projections found on the edges of gears, which are mechanical components used to transmit motion and force. These teeth interlock with the teeth of another gear, allowing them to work together to change the direction or speed of movement. The design and spacing of gear teeth are crucial for efficient operation, as they determine how smoothly the gears mesh. The shape of gear teeth can vary, with common types including spur gears, helical gears, and bevel gears. Each type has a specific application, depending on the required speed, torque, and direction of movement. Proper alignment and maintenance of gear teeth are essential for the longevity and performance of machinery.