Periodontal disease

Caused by:
The mouth contains a wide variety of
bacteria, but only a few specific species of bacteria are believed to cause
dental caries: Streptococcus mutans and Lactobacilli among them.[5] Particularly for root caries, the most closely
associated bacteria frequently identified are Lactobacillus acidophilus, Actinomyces viscosus, Nocardia spp., and
Streptococcus mutans. Bacteria collect around the teeth and gums in a sticky, creamy-coloured mass called
plaque, which serves as a biofilm.

Streptococci: skin and throat infections, rheumatic fever, glomerulonephritis,  reactive arthritis,
septicemia, streptococcal toxic shock syndrome, and necrotizing fasciitis "flesh
eating", strep throat, meningitis, bacterial pneumonia, endocarditis, erysipelas,  otitis
media, meningitis, dental abscesses, acute rheumatic fever, scarlet fever, and acute
glomerulonephritis, upper respiratory system, lungs, urogenital infections, tooth decay,
antibiotic resistance

Actinomycetes: fungus-like bacteria; marked by indolent inflammatory lesions of the lymph nodes
draining the mouth, by intraperitoneal abscesses, or by lung abscesses, necrotizing
"flesh eating". Multiple antibiotic resistance

Nocardia is found in soil around the world. It can be contracted by inhaling contaminated dust or via
contamination of a wound with soil containing Nocardia..."

Streptococcus mutans, a contributor to dental caries.

Streptococcus viridans, a cause of endocarditis and dental abscesses.