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Bifidobacterium
Obligate anaerobes
At least 10 species of Bifidobacterium have been isolated from the human mouth
B. dentium has been isolated from plaque and deep dentinal carious lesions
The bifidobacteria are obligate anaerobes.  There are at least 10 species of Bifidobacterium that have been isolated from the human mouth.  B. dentium has been isolated from caries.
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