Cattle's deciduous teeth (that is, the teeth that grow after birth) are small and white, with obvious neck and large tooth gap; Permanent teeth (that is, new teeth that regrow after deciduous teeth fall off) are large and thick, yellowish in color, neatly arranged and close to each other. Generally, 1 pair of deciduous incisors grow out about half a month after birth, and after four pairs of deciduous incisors grow together for about 4-5 months, they gradually wear and become shorter. Buffalo is about 3 years old, and 1.5-2-year-old cattle's 1 pair of primary teeth fall off and grow 1 pair of permanent teeth, that is, 1 pair falls off every year, and gradually changes from "four teeth" and "six teeth" to "eight teeth".
After the bull's-eye, the permanent teeth began to wear in turn, and the wear surface gradually changed from rectangular pattern to black ellipse and then to triangle, and the gap between teeth gradually expanded until the root was exposed and the permanent teeth fell off. The rectangular pattern on the worn surface of teeth is "imprint". Buffalo is about 7 years old, and cattle is about 5.5-6 years old, so they wear 1 pair every year until the "eight seals". Buffalo 10 years old, yellow cattle 8.5-9 years old. The black oval pattern on the worn surface of teeth is "beads". Buffalo is about 1 1 year old, and yellow cattle is 9.5-1year old, and so on, until "eight plants" (full of pearls, also known as "old mouth"). Buffalo manzhu 14 years old, and cattle manzhu 12.5- 13 years old. Buffalo 14 years old and cattle 13 years old have basically lost their service performance and reproductive performance.