Permanent teeth Permanent teeth Permanent teeth or adult teeth are the second set of teeth formed in diphyodont mammals. In humans and old world simians, there are thirty-two permanent teeth, consisting of six maxillary and six mandibular molars, four maxillary and four mandibular premolars, two maxillary and two mandibular canines, four maxillary and four mandibular incisors. The first permanent tooth usually appears in the mouth at around six years of age, and the mouth will then be in a transition time with both primary (or deciduous dentition) teeth and permanent teeth during the mixed dentition period until the last primary tooth is
Pharyngeal teeth new species of "Meiopriapulus", a marine worm in the Priapulida, bears pharyngeal teeth. Fossils of the "Yunnanozoon" and "Haikouella" possess pharyngeal teeth. The lower pharyngeal bones of cichlids also carry specialized teeth which augment their normal mandibular teeth in the breakdown of food. Pharyngeal teeth Pharyngeal teeth are teeth in the pharyngeal arch of the throat of cyprinids, suckers, and a number of other fish species otherwise lacking teeth. Many popular aquarium fish such as goldfish and loaches have these structures. Members of the genus "Botia" such as clown loaches are known to make distinctive clicking sounds when they grind