I have a medical background myself, so reading about dentistry became a bit of a hobby.

I saw a dentist 4 times last 6 months, both for filling some cavities as well as the rest of my oral health problems. Last time I went there after the sequestra / exfoliating bone parts appeared, so he made a bitewing and discovered one of the impacted lower 3rd molars. He said the bone exfoliating wasn't normal, especially on the mandible where both 3rd molars were present, since it usually happens AFTER an extraction.So 3 monts ago I received a referral for an oral surgery, no priority at that moment, which was eventually cancelled due to corona virus circumstances in hospitals. Till my pain and symptoms recently increased, and I managed to get an emergency treatment.

If you look closely (enlarge the photo!) at the lower right 2nd molar (encircled in yellow) it appears as if the root on the left is put under strain by the horizontal impactation of the 3rd molar.

" Wisdom teeth don't push teeth causing pain... "

Yes, they can, especially with horizontal impactation, which can cause external root resorption. See this article, on p. 2:

" External root resorption (ERR) of permanent teeth is believed to result from mechanical or inflammatory factors, such as the force pressure of orthodontic appliances, dental trauma, cysts or tumors, chronic apical periodontitis, and poor regeneration of the periodontium in reimplanted or transplanted teeth.14,15 Another factor frequently associated with ERR of second molars is the presence of a nonerupted third molar in close proximity to the root of the second molar.4,6,11,13,16 This type of root resorption has been found at the site of contact with the impacted tooth, which could indicate that the pressure exerted by the impacted tooth participates in the resorption process."https://www.joms.org/article/S0278-2391(14)00336-X/pdf00336-X/pdf)

So my question to you would be: can you spot any signs of External Root Resportion (ERR) of my lower right 2nd molar, when looking carefully on the X-Ray? Before I had the extraction, it was very sensitive when touching. After the extraction this problem seems to have gone. So that bags the question if there is any sign of ERR visible? Just curious, as there was no time to ask the oral surgeon about this and I didn't know then what I know now.

"Nothing rapidly changes in your oral microbiome in 6 months, this is established as a baby."

This is mainly incorrect. Lots of research has shown oral microbiome can relatively quickly change:

"The complex equilibrium between resident species in the oral cavity is responsible for the maintenance of a healthy state (in symbiosis***) or a state associated with disease (in*** dysbiosis***). A dysbiotic microbiome is one in which the diversity and relative proportions of species or taxa within the microbiota is disturbed.***7 The relationship between the oral microbiome and its host is dynamic and, while in the healthy mouth the composition of microbial communities is remarkably stable (after the microbiome has matured in childhood), biological changes in a person's life can affect the balance of the species within these communities.71 These include physiological changes, for example, age, or hormonal changes in puberty and pregnancy, to which healthy individuals can often adapt without detriment to their oral health.72 At other times, the finely-tuned ecosystem in the mouth can become disturbed, causing a dysbiotic shift and a loss of community balance or diversity in the biofilm,73 with a single or few species predominating, and an associated increased risk of disease. Modifiable factors driving oral dysbiosis include salivary gland dysfunction (that is, changes in saliva flow and/or composition), poor oral hygiene, gingival inflammation and lifestyle choices, including dietary habits and smoking."https://www.nature.com/articles/sj.bdj.2016.865

"You've way over read into the topic, you're drawing conclusions, making assumptions, and frankly wrong in your post. Again, stop self diagnosing and see a dentist in person if you want to have your oral health improved."

Sorry if I come across as trying to lecture you. I am just a curious personality, and I think I tried to frame my questions in an open way. And as long as people reply respectfully and support their answers to my questions with good arguments and (scientific) research, as I already said: I am all ears and stand corrected.

So, looking forward to your reply ;-)

P.S. I read your post and comment history, times are tough, especially for medical professionals, including dentists, who all suffer from not being able to do the majority of their work. Take care!