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"A Tooth is one of the hard bodies of the mouth, attached to the skeleton, but not forming part of it and developed from the dermis or true skin. True teeth consist of one, two, or more tissues differing in their chemical composition and in their microscopical appearances. Dentine, which forms the body of the tooth, and 'cement,' which forms its outer crust, are always present, the third tissue, the 'enamel,' when present, being situated between the dentine and cement. The incisors, or cutting teeth, are situated in front. In men there are two of these incisors in each side of each jaw. The permanent incisors, molars, and premolars are preceded by a set of deciduous or milk teeth, which are lost before maturity, and replaced by the permanent ones. The canines come next to the incisors. In man there is one canine tooth in each half-jaw. The premolars (known also as bicuspids and false molars) come next in order to the canines. In man there are two premolars in each half-jaw. The true molars (or multicuspids) are placed most posteriorly. In man there are three molars in each half-jaw, the posterior one being termed the wisdom tooth. The figures [in the illustration] refer to months after birth."—(Charles Leonard-Stuart, 1911)

First Teeth

"A Tooth is one of the hard bodies of the mouth, attached to the skeleton, but not forming part of it…

"A Tooth is one of the hard bodies of the mouth, attached to the skeleton, but not forming part of it and developed from the dermis or true skin. True teeth consist of one, two, or more tissues differing in their chemical composition and in their microscopical appearances. Dentine, which forms the body of the tooth, and 'cement,' which forms its outer crust, are always present, the third tissue, the 'enamel,' when present, being situated between the dentine and cement. The incisors, or cutting teeth, are situated in front. In men there are two of these incisors in each side of each jaw. The permanent incisors, molars, and premolars are preceded by a set of deciduous or milk teeth, which are lost before maturity, and replaced by the permanent ones. The canines come next to the incisors. In man there is one canine tooth in each half-jaw. The premolars (known also as bicuspids and false molars) come next in order to the canines. In man there are two premolars in each half-jaw. The true molars (or multicuspids) are placed most posteriorly. In man there are three molars in each half-jaw, the posterior one being termed the wisdom tooth. The figures [in the illustration] refer to years after birth."—(Charles Leonard-Stuart, 1911)

Second Teeth

"A Tooth is one of the hard bodies of the mouth, attached to the skeleton, but not forming part of it…