What is chromogenic bacteria example?

Chromogenic bacteria were proposed as an etiological factor in the production of black pigment. Periodontal pathogens such as Porphyromonas gingivalis, Prevotella intermedia, and Prevotella nigrescens are reported to be black-pigmented anaerobes in oral cavity[13].

What causes chromogenic bacteria on teeth?

Orange Stained Teeth

Orange tooth stains typically occur near the gum line and are caused by the presence of chromogenic (photographic) bacteria or food buildup. Children are especially prone to orange tooth stains, usually as a result of improper or infrequent brushing.