All birds do not have teeth. Some notable mammals that are … (Polyphyodonts don't have tooth fairies. Most mammals have baby teeth. Most mammals have deciduous teeth ("baby" or "milk" 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." 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. These are just little ridges to help them chew their food. Their eruption and replacement is species specific and can often be used to estimate age. 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!) Why haven’t we evolved to grow new teeth? Baby teeth don’t matter. 2. Most mammals are born with a special set of usually smaller, weaker teeth called milk teeth or deciduous teeth. Humans, same with other mammals, are diphyodonts. Now you might ask why mammals have only two sets of teeth while reptiles gain and lose teeth throughout life. But why is it really necessary? 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 … 3. So for mammals the choices are extremely simple endless teeth or a set number of different complex teeth. It is a term describing any animal that has two successive sets of teeth. Some birds might have bumps on their beaks, but they are not teeth. 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. Most mammals, however, have only two generations of teeth ** I’d especially like to hear from those who believe in evolution. Your own toothage may vary. The mammals that don’t have teeth include: Anteaters and Pangolins. By 6 weeks, all of the deciduous teeth are fully erupted. Animals that replace their teeth continuously over the course of their lifetimes—such as sharks, geckos, alligators, and crocodiles—are known as polyphyodonts. They'd go broke.) Vertebrates like fish and reptiles have baby teeth too. 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. The deciduous teeth fall out and the adult teeth start coming in at around 12 weeks. The word is not as difficult as it might seem. Most mammals are diphyodonts, meaning that they have two sets of teeth in their lifetime: deciduous, or “baby” teeth, and permanent teeth. Most mammals also have two sets of teeth. 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