Since we are talking dental health, any insights into gingival recession? I think my gums have receded due to brushing them too hard over the years. You can’t tell unless you flip my gums back.
Uneducated Speculation: My theory is that the gums can regenerate and regain attachment loss but only in the right conditions -> in practice that would mean that they are not inflamed, and clean underneath the gum line (you can do that by flossing and getting a deep cleaning at a dentist if you need one), as well as doing your best to eliminate harmful bacteria that turn into calculus, and having a healthy diet.
The trickiest part is probably selectively eliminating the bad bacteria while retaining the good ones The mouth is full of both and mouthwashes like Listarine, or any Alcohol based ones are sledgehammers. Some washes are too harsh on the tissue itself too which I imagine impairs healing of any kind.
Might also be worth looking into all the substrates required for bone and connective tissue building, apart from the obvious (calcium, magnesium), e.g. silica, iron and copper.
Now what I do is more like sweeping; I use a regular toothbrush, and pull it over my teeth and gums at an angle to increase the sweeping area. This cleans much more of my month, so it’s less acidic, and this just feels better than what I was doing before. I also floss to break up biofilms in the gumline. Gums much happier.
Neither a toothbrush nor floss is going to clear those areas effectively, and I noticed an immediate improvement in my gum inflammation levels when I started using them.