Also see Toothache. The most common bacteria concerning dental infections are: Streptococcus mutans, the main organism causing dental caries, Streptococcus sanguinis, represents 50% of dental plaque streptococci, Streptococcus salivarius, represents 50% of streptocycchi contained in saliva, Streptococcus milleri, implicated in the formation of dental abscesses, Lactobacillus, secondary colonizer in caries, mainly affects dentin, Porphyrius monas gingivalis is associated with rapidly progressive periodontitis, Porphyromonas endodontalis appears to be specifically related to endodontic infections., Infections can also be caused by: Actinobacillus actinomycetem-comitans, Porphyromonas gingivalis, Prevotella intermedia, Bacteroides forsythus, Campylobacter rectus, Eubacterium species, Fusobacterium nucleatum, Eikenella corrodens and Pepto-streptococcus micros.