Stale breath. Independently from the frequency of teeth cleaning and other trap cleaning procedures the smell from the mouth is constantly wicked and smelly. This smell is nothing else but the by-product of the liquid from nose sinus, which gets right to the throat back. The condition of the teeth does not matter at all in this case. The disgusting smell is a mixture of the air and the back throat infection.
Long lasting cold. It is well-known especially among the younger generation, is not it? First, the cold comes, after some time the cold causes sinus infection. Still the patients are convinced that all they have is just a cold until the symptoms will last for too long. That is why if one notice that some cold markers last for more than a week and nothing is changing despite medical treatment, the patient must have a sinus infection.