Your own toothage may vary. Mammals, like birds, possess a four-chambered heart. They'd go broke.) Most mammals are born with a special set of usually smaller, weaker teeth called milk teeth or deciduous teeth. Baby teeth don’t matter. (Polyphyodonts don't have tooth fairies. Humans, same with other mammals, are diphyodonts. As a human, our baby teeth start growing during the embryonic phase, consisting of ten top and bottom teeth. Now you might ask why mammals have only two sets of teeth while reptiles gain and lose teeth throughout life. Most mammals also have two sets of teeth. And they come through, on an ingoing and outgoing basis throughout their life. 2. Vertebrates like fish and reptiles have baby teeth too. Most mammals have baby teeth. All birds do not have teeth. Other vertebrates are polyphyodonts: their teeth are replaced throughout their entire life. We have a total of 20 deciduous or baby teeth and 32 permanent teeth. The pattern found instead in most mammals (and believed to be primitive for the group) is diphyodonty, a term derived from Greek words meaning "twofold production of teeth." 3. The teeth differ from that of placental mammals, so that all taxa except wombats have a different number of incisors in the upper and lower jaws. Most mammals are diphyodonts, meaning that they have two sets of teeth in their lifetime: deciduous, or “baby” teeth, and permanent teeth. The deciduous teeth fall out and the adult teeth start coming in at around 12 weeks. Wrong. It just means that we have two generations of teeth, generally known as our baby teeth and our permanent teeth (oh, if only the last were true!) The mammals that don’t have teeth include: Anteaters and Pangolins. By 6 weeks, all of the deciduous teeth are fully erupted. But why is it really necessary? So for mammals the choices are extremely simple endless teeth or a set number of different complex teeth. Why haven’t we evolved to grow new teeth? Most mammals have deciduous teeth ("baby" or "milk" teeth). For example, puppies and kittens are born without teeth. Dogs and cats, for example, get their baby teeth in a few weeks and then lose them in a few months (I don't know what that is … Note there are one group of mammals that does keep regrowing teeth, cetaceans have re-evolved polydont by giving up the differentiated heterodont complex teeth of other mammals, they have lost the genes entirely. Deciduous teeth – commonly known as baby teeth, milk teeth, temporary teeth, and primary teeth – are the first set of teeth in the growth development of humans and other diphyodont mammals. Most mammals, however, have only two generations of teeth ** I’d especially like to hear from those who believe in evolution. These are just little ridges to help them chew their food. Humans have twenty baby teeth and thirty-two permanent teeth. 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