Dental morphology is highly differentiated among human populations and some researchers have indicated that dental morphology is influenced by genetic factors. In Asian and Asia-derived populations are common several dental features such as upper first and second incisors shovel-shaped and not aligned with the other teeth, upper first premolars with one root and lower first molars with three roots.
Tooth-shovelling was the dental feature most studied and is frequent in Asia, with a south-to north increasing cline, but rare or absent in Africa and Europe. However, other dental traits such as crown size and presence and number of molar cusps seems to be related to some genetic variations in loci that participate in the developmental pathways of teeth, glands, hair and other ectoderm related organs.
Gene or region studied