The diastema and the abnormal frenum.
D002648:Child; D003937:Diagnosis, Differential; D003970:Diastema / Q000209:etiology / Q000628:therapy*; D004200:Diseases in Twins; D005260:Female; D006801:Humans; D007742:Labial Frenum / Q000601:surgery*; D009971:Orthodontics, Corrective / Q000379:methods; D011247:Pregnancy; D014430:Twins, Monozygotic