Abstract
The development of the jaws and dentition during half a billion years of evolution is described in broad lines and two theories regarding the origin of the dentition are discussed in detail. It is highly likely our dentition developed from dermal ossification 'denticles' originally protecting, in particular, the head of primitive extinct vertebrates. Simple, at first tubercular, later conical teeth developed into complex tooth and molar forms, especially in mammals. Special attention is given to the development of molar cusps. The process of continuous replacement of the dentition is also discussed in more detail.
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