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We know that some animals do not have real teeth consisting of enamel and dentin. Many have tooth-like structures but different constitutions. However, there are animals that have neither, and have developed different mechanisms to obtain food.
The best known of these is the anteater, which has long and sticky tongue, but unlike other mammals, has no teeth. This is a rare feature among mammals, which usually have two dentitions. The anteater, which loves to eat ants, termites and small worms, has a kind of long beak, but its jaws are smooth with no teeth.
The fact that they have no teeth is compensated by a long, slim, sticky tongue that can reach their fangs that are far away from their body.
Importantly, the anteater, as well as the pangolin (mammal that lives in tropical Asia and Africa), both puppies and adults, although they have no teeth, have vestigial teeth in the embryos, but they disappear before birth.
Another animal we can name is the platypus, whose pups create a tooth in the tip of its beak (known as an egg tooth) consisting of enamel and dentin, which helps the animal break the shell of the egg at birth. However, this structure is lost after two days of hatching. Also, they really don't need their teeth, because their beaks can do whatever their teeth do.
We should exclude animals such as the sloth, armadillo and aardvark from this list, as they have teeth, although without enamel (only dentine with a pulp cavity inside).