Editing Dentition (section)

==Overview==
The evolutionary origin of the vertebrate dentition remains contentious. Current theories suggest either an "outside-in" or "inside-out" evolutionary origin to teeth, with the dentition arising from [[odontode]]s on the skin surface moving into the mouth, or vice versa.<ref>{{cite journal |last1=Fraser |first1=G. J. |display-authors=etal |year=2010 |title=The odontode explosion: The origin of tooth-like structures in vertebrates |journal=BioEssays |volume=32 |issue=9 |pages=808–817 |doi=10.1002/bies.200900151|pmid=20730948 |pmc=3034446 }}</ref> Despite this debate, it is accepted that vertebrate teeth are homologous to the dermal denticles found on the skin of basal Gnathostomes (i.e. Chondrichtyans).<ref>Martin et al. (2016) Sox2+ progenitors in sharks link taste development with the evolution of regenerative teeth from denticles, PNAS</ref> Since the origin of teeth some 450 mya, the vertebrate dentition has diversified within the [[reptile]]s, [[amphibian]]s, and [[fish]]: however most of these groups continue to possess a long row of pointed or sharp-sided, undifferentiated teeth (''homodont'') that are completely replaceable. The mammalian pattern is significantly different. The teeth in the upper and lower jaws in mammals have evolved a close-fitting relationship such that they operate together as a unit. "They 'occlude', that is, the chewing surfaces of the teeth are so constructed that the upper and lower teeth are able to fit precisely together, cutting, crushing, grinding or tearing the food caught between."<ref name="Weiss&Mann1985pp130-131"/>

[[Mammal]]s have up to four distinct types of teeth, though not all types are present in all mammals. These are the [[incisor]] (''cutting''), the [[canine tooth|canine]], the [[premolar]], and the [[molar (tooth)|molar]] (''grinding''). The incisors occupy the front of the tooth row in both upper and lower jaws. They are normally flat, chisel-shaped teeth that meet in an edge-to-edge bite. Their function is cutting, slicing, or gnawing food into manageable pieces that fit into the mouth for further chewing. The canines are immediately behind the incisors. In many mammals, the canines are pointed, tusk-shaped teeth, projecting beyond the level of the other teeth. In carnivores, they are primarily offensive weapons for bringing down prey. In other mammals such as some primates, they are used to split open hard-surfaced food. In humans, the canine teeth are the main components in occlusal function and articulation. The mandibular teeth function against the maxillary teeth in a particular movement that is harmonious to the shape of the occluding surfaces. This creates the incising and grinding functions. The teeth must mesh together the way gears mesh in a transmission. If the interdigitation of the opposing cusps and incisal edges are not directed properly the teeth will wear abnormally (attrition), break away irregular crystalline enamel structures from the surface (abrasion), or fracture larger pieces (abfraction). This is a three-dimensional movement of the mandible in relation to the maxilla. There are three points of guidance: the two posterior points provided by the temporomandibular joints and the anterior component provided by the incisors and canines. The incisors mostly control the vertical opening of the chewing cycle when the muscles of mastication move the jaw forwards and backwards (protrusion/retrusion). The canines come into function guiding the vertical movement when the chewing is side to side (lateral). The canines alone can cause the other teeth to separate at the extreme end of the cycle (cuspid guided function) or all the posterior teeth can continue to stay in contact (group function). The entire range of this movement is the envelope of masticatory function. The initial movement inside this envelope is directed by the shape of the teeth in contact and the Glenoid Fossa/Condyle shape. The outer extremities of this envelope are limited by muscles, ligaments and the articular disc of the TMJ. Without the guidance of anterior incisors and canines, this envelope of function can be destructive to the remaining teeth resulting in periodontal trauma from occlusion seen as wear, fracture or tooth loosening and loss. The premolars and molars are at the back of the mouth. Depending on the particular mammal and its diet, these two kinds of teeth prepare pieces of food to be swallowed by grinding, shearing, or crushing. The specialised teeth—incisors, canines, premolars, and molars—are found in the same order in every mammal.<ref name="Weiss&Mann1985p132-135"/> In many mammals, the infants have a set of teeth that fall out and are replaced by [[adult teeth]]. These are called [[deciduous teeth]], primary teeth, baby teeth or milk teeth.<ref name=Swindler2002/><ref name="CambridgeDictHumBiol&Evolp135"/> Animals that have two sets of teeth, one followed by the other, are said to be diphyodont. Normally the dental formula for milk teeth is the same as for adult teeth except that the molars are missing.<ref>{{Cite web |date=November 30, 2018 |title=What Is a Diphyodont? |url=https://www.worldatlas.com/articles/what-is-a-diphyodont.html |url-status=live |website=Worldatlas}}</ref>