The exact mechanism of the formation of dens evaginatus and<unk>  is unknown. It has been suggested that the anomaly is caused by an evagination. The formation of the "cusp" is due to excess layering of the internal enamel epithelium and dental papilla into the stellate reticulum. This occurs during the morphological differentiation stage of tooth development. During the developmental stages of tooth formation, certain dental follicle cells were differentiated incorrectly which formed the excess enamel and incorrect morphology of the affected tooth.<unk>  can progress into severe dental problems if the severity of the<unk>  affects the person's hygiene and oral functions.<unk>  may occur on its own or associated with other dental anomalies such as mesiodens, odontome, unerupted or impacted teeth, peg-shaped maxillary incisor, dens invaginatus, cleft lip, bilateral gemination, fusion, and supernumerary teeth.
Talon cusp
Cradle cap
Harrison's groove
Cobb angle
Axon hillock
Cementicle
Apex 
Tycoon's cap