Why might it be that when when you have a dental infection, your white blood count doesn't rise?

It Can: If the infection is confined to the hard surfaces of the tooth, there is no blood component. However, if the infection encompasses the gums, nerve, or other vascular component of the mouth, then an increased white blood cell count is definitely probable, as it would be in any other infection. Many times patient's say "it doesn't hurt, why treat it?" this is a perfect reason why it is necessary!

Infection severity: Often times we group all dental infections into one category or 'present' or 'not present.' in reality, when they occur tooth abscesses exist as a spectrum of barely there to severe. Our immune systems can do an amazing job at keeping dental abscesses localized and from spreading. Eventually, however, the immune system becomes overwhelmed. Until this happens, most systemic signs are absent.