The Siberian Husky is not a one-person dog. Nor is he a guard dog. He might let you know someone is around, but he has no concept of protecting you. The Siberian is a friendly and gentle dog who is not overly suspicious of strangers or aggressive toward other dogs.
The short answer is yes, it's entirely possible to have RA in your jaw-RA affects joints and your jaw is a joint. In my personal experience, I find jaw pain one of the most difficult to cope with, it's as if it permeates everything, making it impossible to ignore.
Most dental problems affect the teeth but there are several conditions such as TMJ which are confined to the jaw only but are no less serious. Other jaw problems include osteonecrosis of the jaw (bone loss in the jawbone) and problems with your bite caused by misaligned jaws.