At six days of age, a horse will have two central incisors. At two weeks of age, the horse will have two second premolars, two third premolars, and two fourth premolars. At six weeks of age, the horse will have two intermediate incisors. At five to six months of age, a permanent first premolar or wolf tooth may be found on the bottom jaw. At six months of age, the horse will have two corner incisors. (If a horse is said to have two of any of these teeth, it means the teeth are in place on both the upper and lower jaw.) Therefore, you should be able to tell if the colt is eight months or four months old depending on whether he has a wolf tooth (which is vestigial in the horse and may not be present) and, more definitely, whether he has corner incisors. These are all temporary teeth, except for the wolf tooth, and are also referred to as baby or milk teeth. They are shorter and smaller than permanent teeth, more triangular and narrower at the base than permanent teeth, and have a more oval table or cutting surface than permanent teeth, which are more triangular at the cutting surface.

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