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2. Tooth enamel - Wikipedia

   en.wikipedia.org/wiki/Tooth_enamel

   The primary mineral is hydroxyapatite, which is a crystalline calcium phosphate. [4] Enamel is formed on the tooth while the tooth develops within the jaw bone before it erupts into the mouth. Once fully formed, enamel does not contain blood vessels or nerves, and is not made of cells.

3. Cementum - Wikipedia

   en.wikipedia.org/wiki/Cementum

   It is attached to the alveolar bone (C) by the fibers of the periodontal ligament and to the soft tissue of the gingiva by the gingival fibers (H). The cells of cementum are the entrapped cementoblasts, the cementocytes. Each cementocyte lies in its lacuna, similar to the pattern noted in bone. These lacunae also have canaliculi or canals.

4. Kaolinite - Wikipedia

   en.wikipedia.org/wiki/Kaolinite

   Kaolinite (/ ˈ k eɪ. ə l ə ˌ n aɪ t,-l ɪ-/ KAY-ə-lə-nyte, -⁠lih-; also called kaolin) [5] [6] [7] is a clay mineral, with the chemical composition Al 2 Si 2 O 5 4.It is a layered silicate mineral, with one tetrahedral sheet of silica (SiO 4) linked through oxygen atoms to one octahedral sheet of alumina (AlO 6).

5. Tooth decay - Wikipedia

   en.wikipedia.org/wiki/Tooth_decay

   Amelogenesis imperfecta, which occurs in between 1 in 718 and 1 in 14,000 individuals, is a disease in which the enamel does not fully form or forms in insufficient amounts and can fall off a tooth. [42] In both cases, teeth may be left more vulnerable to decay because the enamel is not able to protect the tooth. [43]

6. Leadhillite - Wikipedia

   en.wikipedia.org/wiki/Leadhillite

   It is heavy, due to the lead content, with specific gravity 6.55, similar to other lead minerals such as cerussite (6.5) and anglesite (6.3). [3] [5] Cleavage is perfect on a plane perpendicular to the c crystal axis. [2] [3] The mineral is usually twinned, according to a variety of twin laws, forming contact, penetration and lamellar twins ...

7. Biomagic "pixie dust" regrows man's lopped-off finger - AOL

   www.aol.com/news/2008-05-01-biomagic-pixie-dust...

   It's the stuff of sci-fi and really crappy awesome horror films, but now it looks like regrowing damaged skin and limbs isn't so far-fetched -- in fact, it's already happening. A certain 69 year ...