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Dentition Pattern
This diagram of the mandibular arch illustrates that two sets of teeth develop in the human, a primary (deciduous) dentition and a secondary (permanent) dentition. Permanent teeth drawn in red are successional (succedaneous) teeth. They arise lingual to the primary teeth and replace (succeed) them. The permanent teeth, outlined in black with yellow centers, are the permanent molars that develop posterior to the primary teeth. They do not have deciduous predecessors, nor are they succeeded by successional teeth. Three types of teeth constitute the primary dentition: incisors, canines, and molars. Four types of teeth constitute the secondary dentition: incisors, canines, premolars, and molars.
The first teeth to develop and erupt into the oral cavity are the deciduous mandibular central incisors - at about six months after birth. The last primary teeth to develop and erupt are the second molars - at about two years of age. The first permanent teeth to erupt are the first molars at about six years of age. The 1st, 2nd, and 3rd permanent molars erupt sequentially at about six year intervals - 6, 12, and 18 (17 to 25) respectively.
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