Science Times - Link Between Brushing Teeth and Dementia: Researchers Say It’s Oral Bacteria
(Photo : Daniel Albany on Pixabay) A new study recently identified bacteria as the link between regular brushing teeth and dementia.

A new study recently identified bacteria as the link between regular brushing teeth and dementia. An article The Ladders published said, regularly brushing teeth just turned out to be a more terrible situation.

The new research, Periodontal dysbiosis associates with reduced CSF Aβ42 in cognitively normal elderly, published in the Alzheimer's & Dementia: Diagnosis, Assessment & Disease Monitoring journal, specified that an abundance of specific oral bacteria might increase the risk of experiencing cognitive decline of an individual later in life.

The link between dementia and gum or oral bacteria has been specified in this new research. Specifically, subgingival periodontal bacteria defines the line of microbes attached to the teeth underneath the gum light.

In this new study, the researchers established a strong correlation between its presence and the build-up of amyloid proteins linked to Alzheimer's in cerebrospinal fluid or CSF in the brain.

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(Photo: Image by Giulia Marotta from Pixabay)

Harmful Oral Bacteria Identified

Hazardous oral bacteria were identified as Porphyromonas, Fretibacterium, and Prevotella. The authors said, to their knowledge, this is the first-ever report of a link between subgingival periodontal bacteria and AD pathology's CSF biomarkers in cognitively normal older adults.

As a result, the study authors wrote they discovered that the subgingival periodontal dysbiosis, as described in the National Library of Medicine, is described by rises in periodontal-linked microbes and drops in health-associated bacteria linked to reduced "CSF Aβ42 although not with CSF P-tau."

The researchers also said their study findings show the essentiality of the microbiome in general, not just the role of bad microbes but of good bacteria and modulating levels of amyloid. Such results suggest that multiple oral bacteria are involved in the amyloid lesion's expression.

The study authors recruited about 48 participants over 65 years of age, without prior background or history of cognitive disorder. Each of the participants had their CSF levels of amyloid quantified alongside microbial samples collected from under the gums.

Their sample, the researchers explained, "is quite homogenous composed of cognitively normal, educated," along with good oral and systemic health habits.

Gum Bacteria Imbalance

In their study, the authors also wrote all medical, imaging, neuropsychological, CSF collection, dental exams, and imaging was standardized.

One trained periodontist conducted all periodontal assessments blind to CSF collection, explained the researchers. Follow-up evaluation showed that participants who had higher amyloid deposit levels in the brain were more likely to specify a gum bacteria imbalance in their mouths.

So, it was less roughly the number of hazardous microbes and more about its imbalance than helpful bacteria.

Such mechanisms, the researchers said, by which the brain amyloid levels build up and are a link to Alzheimer's pathology are multifaceted and only partly understood.

As the findings revealed, this new study adds support to the insight that proinflammatory illnesses interrupt the clearance of amyloid from the brain, as amyloid's retention in the brain can be approximated from the levels of CSF.

Lastly, the report said, it should be noted that more than 40 percent of the sample carried gene expression associated with the development of AD.

Furthermore, given the comparatively small size of the study sample and the number of variables at play, no causal association could be established.

A related report is shown on CBS News's YouTube video below:

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