Teeth

A horse's teeth include incisors, premolars, molars, canine teeth, and sometimes wolf teeth. A horse's incisors, premolars, and molars, once fully developed, continue to erupt throughout its lifetime as the grinding surface is worn down through chewing. Because of this pattern of wear, a rough estimate of a horse's age can be made from an examination of the teeth. Abnormal wear of the teeth, caused by conformational defects, abnormal behaviors, or improper diets, can cause serious health issues and can even result in the death of the horse.



Source: en.wikipedia.org/wiki/Equine_anatomy#Teeth