Editing Human tooth (section)

====Destruction after development====
Tooth destruction from processes other than [[dental caries]] is considered a normal physiologic process but may become severe enough to become a pathologic condition. [[Attrition (dental)|Attrition]] is the loss of tooth structure by mechanical forces from opposing teeth.<ref>"[http://www.adha.org/CE_courses/course9/loss_of_structure.htm Loss of Tooth Structure] {{Webarchive|url=https://web.archive.org/web/20121227091702/http://www.adha.org/CE_courses/course9/loss_of_structure.htm |date=2012-12-27 }}", American Dental Hygiene Association.</ref> Attrition initially affects the enamel and, if unchecked, may proceed to the underlying dentin. [[Abrasion (dental)|Abrasion]] is the loss of tooth structure by mechanical forces from a foreign element.<ref>"[https://web.archive.org/web/20100801114913/http://dentistry.umkc.edu/practition/assets/AbnormalitiesofTeeth.pdf Abnormalities of Teeth]", University of Missouri-Kansas City School of Dentistry.</ref> If this force begins at the cementoenamel junction, then progression of tooth loss can be rapid since enamel is very thin in this region of the tooth. A common source of this type of tooth wear is excessive force when using a toothbrush. [[Erosion (dental)|Erosion]] is the loss of tooth structure due to chemical dissolution by acids not of bacterial origin.<ref>{{cite journal|url=http://www.agd.org/library/2003/aug/200308_yip.pdf |pmid=15055615 |year=2003 |last1=Yip |first1=KH |last2=Smales |first2=RJ |last3=Kaidonis |first3=JA |title=The diagnosis and control of extrinsic acid erosion of tooth substance |volume=51 |issue=4 |pages=350–3; quiz 354 |journal=General Dentistry |url-status=dead |archive-url=https://web.archive.org/web/20060907094153/http://www.agd.org/library/2003/aug/200308_yip.pdf |archive-date=September 7, 2006 }}</ref> Signs of tooth destruction from erosion is a common characteristic in the mouths of people with [[bulimia]] since [[vomiting]] results in exposure of the teeth to gastric acids. Another important source of erosive acids are from frequent sucking of [[lemon juice]]. [[Abfraction]] is the loss of tooth structure from flexural forces. As teeth flex under [[pressure]], the arrangement of teeth touching each other, known as [[occlusion (dentistry)|occlusion]], causes [[Tension (mechanics)|tension]] on one side of the tooth and [[compression (physical)|compression]] on the other side of the tooth. This is believed to cause V-shaped depressions on the side under tension and C-shaped depressions on the side under compression. When tooth destruction occurs at the roots of teeth, the process is referred to as [[internal resorption]], when caused by cells within the pulp, or [[external resorption]], when caused by cells in the periodontal ligament.