Ancestors of dogs and cats mostly ate meat in the wild as well as after domestication. True that they ate hard bones. Nowadays we use dry kibbles mostly because that is cheaper and easier. Given that these are made very dry to improve the shelf life, they must be somewhat abrasive to the throat and esophagus. At least my dog gulps its meals within seconds, too fast for any saliva to lubricate I assume. I wonder if this constant abrasion can cause harm over 12-16 year life span of a large dog.
My question is, has there been any studies on the long term effect of dry kibbles on dogs health?
Edit: I am looking specifically for any academic studies on the abrasiveness since it is 'unnatural'.