Bite irregularity refers to an incorrect relationship between upper and lower teeth. While non-nutritive oral habits and inadequate oral hygiene can play a role in malocclusion, heredity often serves as the dominant factor in its development. Facial bone morphology are passed down through family lines, as is the spacing between teeth. When familial jaw size is reduced, their children are much more prone to inherit similar characteristics. Similarly, the skeletal growth pattern between jaws—whether one protrudes more than the other—is strongly influenced by hereditary programming. This can lead to deep bites, underbites, or lateral jaw misalignment. Even the number of teeth a person develops, including third molar development, is coded in the genome. Because these traits are transmitted across generations, dental misalignment shows familial patterns. While external influences can modify the condition, the underlying skeletal and dental framework is typically set by genetics. This is why dentists routinely review pedigree data when assessing case complexity. Genetic risk assessment can help identify genetic risks, allowing for timely intervention. Although braces and other appliances can correct alignment issues, understanding the genetic basis helps explain why some cases are more complex and may require extended therapy or 東京 部分矯正 even orthognathic surgery. Ultimately, genetics provides the blueprint, and while we can adjust the alignment, we cannot alter the genetic code.