Choose from:
1). This can cause poor hygiene and, during chronic dental problems, in many cases, even death. Be on the lookout for: licks, biting..
2). Dogs can have bad breath for a wide variety of reasons. The key is to identify when the smell changes or becomes markedly worse..
3). The alteration in the odor is the most noticeable difference between the usual normal smell and a more pungent odor. The one major difference is that dental disease does not leave behind a scent; just it dissolves it..
4). For example, a dog with gingivitis may develop bad breath. Infected gingivitis doesn't smell good on your dog..Choose from options above and answer: What most naturally follows?

How to diagnose dental disease in dogs
Pay attention to unusually bad breath.
If your dog's breath is worse than usual, it could be a sign that your dog has dental disease. With dental disease, bacteria and infected tissue can exude a putrid smell once it has developed quite a bit.
Answer:
2).