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2. Human tooth - Wikipedia

   en.wikipedia.org/wiki/Human_tooth

   Bottom teeth of a seven-year-old, showing primary teeth (left), a lost primary tooth (middle), and a permanent tooth (right) Tooth eruption in humans is a process in tooth development in which the teeth enter the mouth and become visible. Current research indicates that the periodontal ligaments play an important role in tooth eruption.

3. Tooth enamel - Wikipedia

   en.wikipedia.org/wiki/Tooth_enamel

   In cross section, it is best compared to a keyhole, with the top, or head, oriented toward the crown of the tooth, and the bottom, or tail, oriented toward the root of the tooth. The arrangement of the crystallites within each enamel rod is highly complex.

4. Dental anatomy - Wikipedia

   en.wikipedia.org/wiki/Dental_anatomy

   The term, "maxillary", is given to teeth in the upper jaw and "mandibular" to those in the lower jaw. There are four classes of teeth: incisors, canines, premolars, and molars. Premolars are found only in permanent teeth; there are no premolars in deciduous teeth. Within each class, teeth may be classified into different traits.

5. Incisor - Wikipedia

   en.wikipedia.org/wiki/Incisor

   Rabbits and hares were once considered rodents, but are distinguished by having six—one small pair, called "peg teeth", is located directly behind the most anterior pair. Incisors are used to bite off tough foods, such as red meat. Cattle (cows, bulls, etc.) have none on top but a total of six on the bottom.

6. Dental arch - Wikipedia

   en.wikipedia.org/wiki/Dental_arch

   The dental arches are the two arches (crescent arrangements) of teeth, one on each jaw, that together constitute the dentition.In humans and many other species, the superior (maxillary or upper) dental arch is a little larger than the inferior (mandibular or lower) arch, so that in the normal condition the teeth in the maxilla (upper jaw) slightly overlap those of the mandible (lower jaw) both ...

7. Cementoenamel junction - Wikipedia

   en.wikipedia.org/wiki/Cementoenamel_junction

   In about 60–65% of teeth, the cementum overlaps the enamel at the CEJ, while in about 30% of teeth, the cementum and enamel abut each other with no overlap. In only 5–10% of teeth, there is a space between the enamel and the cementum at which the underlying dentin is exposed. [3]