One of the comments said they'd heard of "filing down a dog's teeth" to prevent biting injuries (at least they went into the pain that goes on with it when telling about it), but never heard pulling all their teeth.
I'm sorry, but I think that any vet and caretaker, that would do anything like this that's not medically necessary, is just plain, ol' evil.
Reminds me of Julius Caesar by Shakespeare:
"The evil that men do lives after them; The good is oft interred with their bones"
I truly have a hard time believing that MANY people here on earth have any good at all to take with them. Especially vets that would actually recommend something like this.