Before the age of 5, the number of teeth that can be exchanged for a tooth is calculated by adding 1 to it. That is, 1 pair of teeth is 2 years old, 2 pairs of teeth are 3 years old, and 3 pairs of teeth are 4 years old. After the age of 5, it mainly depends on the tooth surface wear and the structure of the bull's teeth. At the beginning of the wear, the teeth are flattened first, and then the change of the tooth surface is observed, which is initially a square or a horizontal oval, and later deepens with the degree of wear. For example, when the clamp teeth were 6 years old, they were square; 7 years old was a triangle; 8 years old was a quadrangle; 10 years old was round with a tooth star; after 12 years, the circle became smaller; at the age of 13 it was a longitudinal oval. The other incisors have the same regularity as the jaws. With age, all incisors begin to shorten.
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