OMG...what a NICE lady huh? First of all, yorkies do tend to have teeth problems, but with care it won;t be anything bigger than what comes with age...With that said, by brushing Snoodle's teeth you are already delaying the "aging" process, by offering dry food and treats that are meant to clean the teeth is another plus
Also, when necessary, you can have you vet to do a teeth cleaning...
About losing the teeth and braking the jaw...i donnou anything about it. But one time i saw on animal planet when they were recuing dogs from a puppy mill, one of the females has lost all her teeth and she wouldn;t even close her mouth right, the vet explained that the bottom jaw turns into a "rubberish" density, now alowing her to even close the mouth completely...i wonder if that is what happened....