the thing about those pictures is that the recession and staining is not due to poor hygiene, and, further, you don't see the bone loss you typically see with periodontitis. so, your typical picture has these receding gums and these little teeth with these gaps between them; where these pictures are more similar is that they have receding gums, but full, healthy teeth - which is more like what i'm experiencing.
but, i mean, i can open my mouth. my fingers aren't falling off...
i still want to understand the mechanism before i move on.