Abfraction: Abfraction is a theoretical concept explaining a loss of tooth structure not caused by tooth decay (non-carious cervical lesions). It is suggested that these lesions are caused by forces placed on the teeth during biting, eating, chewing and grinding; the enamel, especially at the cementoenamel junction (CEJ), undergoes large amounts of stress, causing micro fractures and tooth tissue loss.Human tooth: The human teeth function in mechanically breaking down items of food by cutting and crushing them in preparation for swallowing and digestion. There are four different types of teeth, namely incisors, canines, molars and premolars.Tooth loss: Tooth loss is a process in which one or more teeth come loose and fall out. Tooth loss is normal for deciduous teeth (baby teeth), when they are replaced by a person's adult teeth.Neonatal line: The neonatal line is a particular band of incremental growth lines seen in histologic sections of a deciduous tooth. It belongs to a series of a growth lines in tooth enamel known as the Striae of Retzius.Talon cuspApical delta: Apical delta refers to the branching pattern of small accessory canals and minor foramina seen at the tip or apex of some tooth roots.Intraosseous eruption: Intraosseous eruption involves the formation of root of a tooth which allows the tooth to being eruption from the bone. This phase precedes the Supraosseous Eruption phase which consists of Infragingival eruption and Supragingival Eruption.Cervical screening: Cervical screening is the process of detecting abnormal changes in the cervix before they can develop into cervical cancer. If the abnormal tissue or cells can be removed, then the disease can be prevented from developing.HyperdontiaTaurodontismHorse teethIron metallic discoloration: Iron metallic discoloration occurred more frequently in the past when soluble iron compounds were used in the treatment of allergic contact and other dermatitis, and in eroded areas iron was sometimes deposited in the skin, like a tattoo .James, William; Berger, Timothy; Elston, Dirk (2005).David Urquhart (bishop)OverjetEnamel spindles: Enamel spindles are "short, linear defects, found at the dentinoenamel junction (DEJ) and extend into the enamel, often being more prevalent at the cusp tips."Histology Course Notes: "Mature Enamel", New Jersey Dental School, 2003-2004, page 2.ConcrescencePulp (tooth): The dental pulp is the part in the center of a tooth made up of living connective tissue and cells called odontoblasts. The dental pulp is a part of the dentin–pulp complex (endodontium).