Table 1. Bacterial phylotype that were more abundant in children with black stain.

Bacterial phylotype	Characteristics	References
Actinomyces	Produce H2S	[21]
	Pigmentation	[22]
	Normal oral flora
Tannerella	Periodontitis(Tannerella forsythia)	[27]
Treponema	Periodontal diseases	[26]
Corynebacterium	Dental calculi (C. matruchotii)	[25]
	Opportunistic pathogen
Cardiobacterium	Endocarditis	[23]
	Normal flora
Haemophilus	Respiratory tract infection	[24]
	Normal flora