Thank you everyone for your answers so far. It has taken me a while to respond, but I would like to address a further dimension to this question that I have heard about, and that I alluded to in my first post. I repeat my original trigger warning - this topic deals with some pretty nasty stuff connected with tooth extraction.
What I would like to ask about is - is there any evidence that full tooth extraction was once commonly practiced, perhaps by force, in institutions (prisons, the military, etc)?
In the 1974 horror / musical / comedy movie “The Phantom of the Paradise”, the first step in turning the originally innocuous protagonist into a monster is sending him to jail for life on the basis of planted drug evidence; when in jail, he and other inmates are forced to “volunteer” for an experimental program where their teeth are extracted and replaced by sharp metal ones, on the premise that teeth are a source of health or hygiene problems. Granted, this movie is a campy horror comedy, but according to what I read, the inspiration for this was taken from some cynical novel or short story about some guy who gradually loses multiple body parts, including ending up in jail at one point, where his teeth are extracted on the basis of that very philosophy of teeth being considered a source of health problems. Are any cases known in real life of prison inmates having tooth extractions forced on them, and for that matter, are any cases known of inmates being forced to be guinea pigs for medical tests / experiments (I mean in the free world, not in places like Nazi Germany or the Soviet Union).
I will give an example to partially answer my own question - and this is just about the nastiest real-life story on this topic that I have come across. I remember reading that a man who as a boy had ended up in a borstal (a kind of juvenile detention center / reformatory), IIRC in Northern Ireland, reported that he had once been put on a bus with a group of other inmates. Allegedly, they were driven to some place where a group of waiting dental students extracted all their teeth without anaesthetic. No more context than this was given other than that I think the article was about abuse of young people in penal institutions (I unfortunately don’t remember the source).
What about the military? I have seen multiple references in fiction (typically in pieces about World War II or the Cold War) about British and American military dentists supposedly preferring to pull teeth to repairing them. I even recall a middle-aged man I knew who had once served in the US Army claiming to me that Army dentists liked to pull teeth (he would have been in the Army in, I don’t know, perhaps in the 80s or 90s? I’m not sure.) My research suggests that they did also repair teeth, but that for example, a lot of dentures were made in the British Army in World War II, not only for soldiers whose teeth were extracted while deployed, but for those who already had dentures and lost them when they fell out and into the mud (or threw them out as they found them uncomfortable or what have you).
Was a tooth extraction something a military dentist could force on you? One of the “young people with dentures” stories that I found online was someone’s anecdote maybe about their brother. As I recall, he served in the US Navy around the time of World War II. He was sent to the dentist and put under general anesthetic. When he woke up, he found that all his teeth had been extracted, and was told that they had been in very bad condition. Was this actually legal? Could the sailor in question have had the dentist charged with a crime and / or sued the Navy?