Apart from helping grind the food to properly reduce the size of substrates for stomach enzymes, their minor role is in giving shape and definition to the animals' jaws. The shape of cheek teeth are directly related to their function, and morphological differences between species can be attributed to their dietary variations. Additionally, the shape a cheek tooth can be mechanically worn down based on diet, which is used to provide insights into the consumption habits of fossilized animals.[3] Proper cleaning of cheek teeth is vital for all species of organisms and many species including humans and ruminants keep it on top of their crucial priority list.