Join Date: Jul 2010
Location: East Central Illinois
I think you should focus on 2yo teeth to 6yo teeth bc they change a great deal in those short years. EVERYBODY should spend some time learning this to keep from being rooked by a seller, even it the seller doesn't know the age of the horse.
I would start with looking at 2yo teeth, then the 20yo, then the 6 yo, then the 10yo. If you put them in order and sequence it's harder to see the differences.
Very young horses have short, straight teeth with caps. Very old horses--which you'll probably never see at the racetrack!--have long, parroted out teeth with Galvayne's groove, the middle of the tooth stain-line, which is easiest to see from the top, outside, incisor. Galvayne's groove begins at age 10, is midway down at age 15, is all the way down the tooth at age 20, recedes 1/2-way down the tooth at 25yo, and disappears at age 30. Once I learned about it, I watched my horses teeth as they aged, from about 8yo through their 20's. VERY helpful bc they carry it with them, like a driver's license. =b