[Current status of juvenile gingival pigmentation in Japanese children and young adults].
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D005260:Female; D005881:Gingiva; D006801:Humans; D007223:Infant; D007564:Japan; D008297:Male; D010858:Pigmentation; D012737:Sex Factors; D014080:Tooth Exfoliation