I brush the dog's teeth a few times a month (mainly because Taro has a crooked tooth and he gets plaque), but I honestly have not had them on raw long enough to see any degradation in tooth health. If they chew raw bone it should clean their teeth. I can foresee their teeth getting bad on just ground raw food... but my dogs had plaque with kibble too so I believe you should always brush their teeth. Plus they get lots of rawhide chews and stuff.
I would be interested in hearing more about your friend's dog that died from salmonella. What raw food was he/she feeding and where did she get it? Was it frozen properly and/or refrigerated? Was the dog otherwise healthy?
I do not believe wild dogs (and I am mainly thinking wolves) are short-lived. A great book called "Decade of the Wolf" following the reintroduction of wolves into Yellowstone details the lives of many of the wolves, and most lived average ages for domesticated dogs.... some even pushing 10.
Its interesting to me because people look at dogs in two ways: wild wolves, or domesticated kibble eaters. Have we forgotten the 10,000 years in between? Dogs have been eating table scraps and the leftovers from cleaning human kills for nearly 10,000 years. For the most part they have deviated from consuming fresh kills. But they have been fed kibble for only maybe a bit longer than 100 years (it would be interesting to look into the subject further). My dog's allergies were enough to question their kibble consumption.
Something that pushed me into feeding raw for ethical reasons was an article similar to this one:
http://www.homevet.com/petcare/foodbook.html
I always take everything I hear with a grain of salt, but it was enough to make me at least consider alternative ways. I am otherwise mostly vegetarian (I will consume organic and free range animals occasionally) so it was important for me to also provide my dogs with meat that was treated ethically not only in life but also in death (ie- organic and free range meats).
Ah sorry again for writing so much, but the subject interests me.
-Diana