What can tooth morphology tell us about a horse? Objective Students will use the scientific method to learn about horse teeth morphology. Background Horses generally have between 36-44 teeth, all shaped for different purposes. Horses are primarily herbivores, meaning they eat plants. They can graze for up to 15-17 hours a day. Horses' incisors (and canines, in male horses) cut plants. Their premolars and molars grind the food before it is swallowed. Over time, eating plants leaves wear patterns on horses' teeth. Grazing continually grinds down the teeth. Over a horse's lifetime, teeth continue Duration: 90 Minutes.