This science diagram is about molar tooth anatomy. A scientific diagram is a picture which shows exactly how an experiment has been set up. They aren't supposed to look like realistic sketches and are drawn in two dimensions. They need to be very clear, precise and easy to understand. Molars: These teeth are broad and flat. They contain 4 to 5 cusps and 2 to 3 roots. Molars grind the food into a paste so that it becomes easier to digest and swallow. The third molar tooth in each quadrant of the mouth is known as the wisdom tooth.