Plaque is caused by bacteria that live on the thin protein layer of the teeth. They need saliva to grow and saliva glands are just behind the lower front teeth, so this is why plaque usually builds up behind the lower front teeth.

Two things that come to my mind:

• Sugar feeds the bacteria.
• Lack of mechanical cleaning. Either via dental tools or chewing with front teeth, especially fibrous foods. I found that on a purely carnivore diet I'd need dental tools quite often, because chewing is pretty much at a minimum.

Maybe acid helps clean the plaque, but I'm not sure, maybe someone has info on this?
Also, I've noticed that including a lot of dairy makes the plaque harder, while meats and vegetables produce soft plaque. Probably, because of the calcium.

It has been re-uploaded by someone else here, if you want to watch it: https://www.youtube.com/watch?v=MxAqytqLMtY

I watched it right when it was uploaded on sv3rige, but apparently the comment section went up in flames later on.

Yeah I haven't been able to to make my diet feel optimal without doing the whole animal approach...and will go so far as to say that without a regular supply of fresh raw blood marrow, guts and organs, I wouldn't be able to make this diet work.

My diet is mostly meat and liver with some vegetables, and eventually I ran out of liver, leaving me with only muscle meat for about 2 weeks. After about one week I felt super tired and had kinda puffy eyes. That went away pretty much immediately after getting liver back in (only 30-50 g per day). Don’t know why so many carnivore advocates think that muscle meat alone is sufficient, when it’s obviously nutritionally inadequate.

https://synapse.koreamed.org/Synapse/Data/PDFData/0140AD/ad-29-706.pdf

“The histamine level in food has changed according to the cooking method used to prepare it. Frying and grilling increased histamine level in foods, whereas boiling had little influence or even decreased it. The boiling method might be helpful to control the effect of histamine in histamine-sensitive or susceptible patients, compared with frying and grilling.”

Maybe the discussion section is worth a read for insights on mechanisms.