Porphyromonas gingivalis, a bacteria involved in gum disease, implicated in Alzheimer's disease, rheumatoid arthritis and aspiration pneumonia. Scientists have traced path of bacterial toxins from the mouth to the brain and other tissues.

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Porphyromonas gingivalis, a bacteria involved in gum disease, implicated in Alzheimer's disease, rheumatoid arthritis and aspiration pneumonia. Scientists have traced path of bacterial toxins from the mouth to the brain and other tissues.