1, cattle have upper teeth, but their lips are thick, which can't be seen; The upper jaw has only molars but no incisors, and the lower jaw has both incisors and molars.

2. Cattle have four pairs of incisors, which change with age. From deciduous teeth to permanent teeth, the surface of incisors is worn to varying degrees, and the gap between incisors also changes.

Extended data:

cattle

The front teeth and canine teeth have degenerated, but the lower front teeth are still there, and the lower canine teeth are also front teeth. Three pairs of front teeth are shoveled forward. Because they feed on hard plants, premolars and molars are high crowns, and the enamel is wrinkled. After the crown is worn, complex tooth patterns are formed on the surface, which is suitable for grazing.

In order to store forage and avoid enemies, their stomachs have evolved into four chambers: rumen, honeycomb stomach, flap stomach and glandular stomach, and they also have the habit of "ruminating" in order to better digest and absorb food.

References:

Baidu encyclopedia Niu