Table 4.

Microbiota found in the literature.

Environment or Pathology	Type of Bacteria	Prevalent Bacteria That to Form the Microbiota
Oral mucosa	Gram-positive, Gram-negative, anaerobic and aerobic	772 Prokaryotic species
Necrotic tooth, Untreated canals	Gram-positive, Gram-negative, anaerobic and aerobic	Eubacteria Prevotella intermedia Peptostreptococcus Fusobacterium Porphyromonas Parvimonas Streptococcus Campylobacter rectus Dialister pneumosintes Actinomyces species Enterococcus faecalis
Persistent intra-radicular infection	Gram-positive, facultative anaerobes	Streptococci Enterococci (Enterococcus faecalis)
Persistent extra-radicular infection	Gram-positive, anaerobic	Actinomycetes (A. israeli) Propionibacterium propionicum