Gum lines are a direct access to the bloodstream. Patients with high dental plaque are shown to also have a very high risk of arterial plague.
Example only...My dad’s mouth was an absolute plaque factory. He died at 69 with 90% plaque blockage of both sides of his heart. His widow removed all her teeth and is alive at 95. Same house. Same diet.
If your gums bleed when brushing, there are a few things happening. You have bacteria in your gums...we all do, but are infected. The bacteria has direct access to your bloodstream.
There are also good studies showing that patients who removed all of their teeth are at a lower risk of heart disease.
Some will simply dismiss these findings by parroting the latest trending claim of “correlation doesn’t price causation”, however, the studies alone show enough evidence that those who push the above claim, either haven’t read the studies, or are simply in denial.
...that is all
These people seem to think they somehow have special knowledge that proves it can't be causative, and that requires a true causative study to allow them their stance, so they belittle the rest of us with their non-existent “proof” when we, and science and math, know better.
We can't say (and aren't saying) it's proven causative, while they are stating it is proven non-causative.
True, correlation does not prove causation; however, it's highly unlikely that heart infections cause dental plaque. The mouth is highly septic, and breaks in containment are the one-way issue.