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An age old, yet nearly forgotten art, is how to tell a horse's age by its teeth. Simply study the pictures below, memorize the special characteristics of each stage. Then go practice on horses that someone knows the age of. See how close you can come to the real age of the horse. 1  When the horse has grown all its permanent teeth it is said to have a full mouth. 2  The age of the horse can be determined with some accuracy by looking at its teeth. 3  As the horse grows and ages the changes that take place can help you tell how old it is.
Horses have two sets of teeth, one temporary and one permanent. Temporary teeth may also be called baby or milk teeth.. Temporary incisors tend to erupt in pairs at 8 days, 8 weeks, and 8 months of age.Young permanent teeth have deep indentures in the center of their surfaces, referred to as cups.he art of determining the age of horses by inspection of the teeth is an old one. It can be developed to a considerable degree of accuracy in determining the age of young horses. The probability of error increases as age advances and becomes a guess after the horse reaches 10 to 14 years of age.