Teeth want to be straight.
D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D003724:Dental Arch / Q000033:anatomy & histology; D005260:Female; D006801:Humans; D008297:Male; D008310:Malocclusion / Q000209:etiology / Q000503:physiopathology* / Q000628:therapy; D012690:Serial Extraction; D014070:Tooth / Q000033:anatomy & histology / Q000502:physiology*; D014078:Tooth Eruption; D014080:Tooth Exfoliation / Q000503:physiopathology